diff --git a/app/build.gradle b/app/build.gradle
index 40205d27be..4854f26844 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -268,7 +268,7 @@ dependencies {
     def dnsjava_version = "2.1.9"
     def openpgp_version = "12.0"
     def badge_version = "1.1.22"
-    def bugsnag_version = "5.9.2"
+    def bugsnag_version = "5.9.4"
     def biweekly_version = "0.6.6"
     def relinker_version = "1.4.3"
     def markwon_version = "4.6.2"
diff --git a/app/src/main/java/com/bugsnag/android/AppDataCollector.kt b/app/src/main/java/com/bugsnag/android/AppDataCollector.kt
index e270d2f96a..f39d817a20 100644
--- a/app/src/main/java/com/bugsnag/android/AppDataCollector.kt
+++ b/app/src/main/java/com/bugsnag/android/AppDataCollector.kt
@@ -6,7 +6,6 @@ import android.content.pm.ApplicationInfo
 import android.content.pm.PackageManager
 import android.os.Build
 import android.os.SystemClock
-import java.util.HashMap
 
 /**
  * Collects various data on the application state
@@ -31,13 +30,19 @@ internal class AppDataCollector(
     private val releaseStage = config.releaseStage
     private val versionName = config.appVersion ?: packageInfo?.versionName
 
-    fun generateApp(): App = App(config, binaryArch, packageName, releaseStage, versionName, codeBundleId)
+    fun generateApp(): App =
+        App(config, binaryArch, packageName, releaseStage, versionName, codeBundleId)
 
-    fun generateAppWithState(): AppWithState = AppWithState(
-        config, binaryArch, packageName, releaseStage, versionName, codeBundleId,
-        getDurationMs(), calculateDurationInForeground(), sessionTracker.isInForeground,
-        launchCrashTracker.isLaunching()
-    )
+    fun generateAppWithState(): AppWithState {
+        val inForeground = sessionTracker.isInForeground
+        val durationInForeground = calculateDurationInForeground(inForeground)
+
+        return AppWithState(
+            config, binaryArch, packageName, releaseStage, versionName, codeBundleId,
+            getDurationMs(), durationInForeground, inForeground,
+            launchCrashTracker.isLaunching()
+        )
+    }
 
     fun getAppDataMetadata(): MutableMap<String, Any?> {
         val map = HashMap<String, Any?>()
@@ -102,9 +107,21 @@ internal class AppDataCollector(
      *
      * @return the duration in ms
      */
-    internal fun calculateDurationInForeground(): Long? {
+    internal fun calculateDurationInForeground(inForeground: Boolean? = sessionTracker.isInForeground): Long? {
+        if (inForeground == null) {
+            return null
+        }
+
         val nowMs = System.currentTimeMillis()
-        return sessionTracker.getDurationInForegroundMs(nowMs)
+        var durationMs: Long = 0
+
+        val sessionStartTimeMs: Long = sessionTracker.lastEnteredForegroundMs
+
+        if (inForeground && sessionStartTimeMs != 0L) {
+            durationMs = nowMs - sessionStartTimeMs
+        }
+
+        return if (durationMs > 0) durationMs else 0
     }
 
     /**
diff --git a/app/src/main/java/com/bugsnag/android/Breadcrumb.java b/app/src/main/java/com/bugsnag/android/Breadcrumb.java
index 698223a6c0..4da160a4ee 100644
--- a/app/src/main/java/com/bugsnag/android/Breadcrumb.java
+++ b/app/src/main/java/com/bugsnag/android/Breadcrumb.java
@@ -94,6 +94,11 @@ public class Breadcrumb implements JsonStream.Streamable {
         return impl.getTimestamp();
     }
 
+    @NonNull
+    String getStringTimestamp() {
+        return DateUtils.toIso8601(impl.getTimestamp());
+    }
+
     @Override
     public void toStream(@NonNull JsonStream stream) throws IOException {
         impl.toStream(stream);
diff --git a/app/src/main/java/com/bugsnag/android/Client.java b/app/src/main/java/com/bugsnag/android/Client.java
index 590bd54f3c..6ed0a6f7b6 100644
--- a/app/src/main/java/com/bugsnag/android/Client.java
+++ b/app/src/main/java/com/bugsnag/android/Client.java
@@ -19,6 +19,7 @@ import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 
 import kotlin.Unit;
+import kotlin.jvm.functions.Function1;
 import kotlin.jvm.functions.Function2;
 
 import java.util.ArrayList;
@@ -83,7 +84,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
     final Logger logger;
     final DeliveryDelegate deliveryDelegate;
 
-    final ClientObservable clientObservable = new ClientObservable();
+    final ClientObservable clientObservable;
     private PluginClient pluginClient;
 
     final Notifier notifier = new Notifier();
@@ -93,6 +94,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
     final LastRunInfoStore lastRunInfoStore;
     final LaunchCrashTracker launchCrashTracker;
     final BackgroundTaskService bgTaskService = new BackgroundTaskService();
+    private final ExceptionHandler exceptionHandler;
 
     /**
      * Initialize a Bugsnag client
@@ -142,6 +144,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         immutableConfig = sanitiseConfiguration(appContext, configuration, connectivity);
         logger = immutableConfig.getLogger();
         warnIfNotAppContext(androidContext);
+        clientObservable = new ClientObservable();
 
         // Set up breadcrumbs
         callbackState = configuration.impl.callbackState.copy();
@@ -213,14 +216,16 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
                 immutableConfig, breadcrumbState, notifier, bgTaskService);
 
         // Install a default exception handler with this client
+        exceptionHandler = new ExceptionHandler(this, logger);
         if (immutableConfig.getEnabledErrorTypes().getUnhandledExceptions()) {
-            new ExceptionHandler(this, logger);
+            exceptionHandler.install();
         }
 
         // register a receiver for automatic breadcrumbs
         systemBroadcastReceiver = SystemBroadcastReceiver.register(this, logger, bgTaskService);
 
         registerOrientationChangeListener();
+        registerMemoryTrimListener();
 
         // load last run info
         lastRunInfoStore = new LastRunInfoStore(immutableConfig);
@@ -249,6 +254,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
             ContextState contextState,
             CallbackState callbackState,
             UserState userState,
+            ClientObservable clientObservable,
             Context appContext,
             @NonNull DeviceDataCollector deviceDataCollector,
             @NonNull AppDataCollector appDataCollector,
@@ -264,13 +270,15 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
             Logger logger,
             DeliveryDelegate deliveryDelegate,
             LastRunInfoStore lastRunInfoStore,
-            LaunchCrashTracker launchCrashTracker
+            LaunchCrashTracker launchCrashTracker,
+            ExceptionHandler exceptionHandler
     ) {
         this.immutableConfig = immutableConfig;
         this.metadataState = metadataState;
         this.contextState = contextState;
         this.callbackState = callbackState;
         this.userState = userState;
+        this.clientObservable = clientObservable;
         this.appContext = appContext;
         this.deviceDataCollector = deviceDataCollector;
         this.appDataCollector = appDataCollector;
@@ -288,6 +296,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         this.lastRunInfoStore = lastRunInfoStore;
         this.launchCrashTracker = launchCrashTracker;
         this.lastRunInfo = null;
+        this.exceptionHandler = exceptionHandler;
     }
 
     private LastRunInfo loadLastRunInfo() {
@@ -350,6 +359,18 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         ContextExtensionsKt.registerReceiverSafe(appContext, receiver, configFilter, logger);
     }
 
+    private void registerMemoryTrimListener() {
+        appContext.registerComponentCallbacks(new ClientComponentCallbacks(
+                new Function1<Boolean, Unit>() {
+                    @Override
+                    public Unit invoke(Boolean isLowMemory) {
+                        clientObservable.postMemoryTrimEvent(isLowMemory);
+                        return null;
+                    }
+                }
+        ));
+    }
+
     void setupNdkPlugin() {
         String lastRunInfoPath = lastRunInfoStore.getFile().getAbsolutePath();
         int crashes = (lastRunInfo != null) ? lastRunInfo.getConsecutiveLaunchCrashes() : 0;
@@ -369,6 +390,17 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
         launchCrashTracker.addObserver(observer);
     }
 
+    void unregisterObserver(Observer observer) {
+        metadataState.deleteObserver(observer);
+        breadcrumbState.deleteObserver(observer);
+        sessionTracker.deleteObserver(observer);
+        clientObservable.deleteObserver(observer);
+        userState.deleteObserver(observer);
+        contextState.deleteObserver(observer);
+        deliveryDelegate.deleteObserver(observer);
+        launchCrashTracker.deleteObserver(observer);
+    }
+
     /**
      * Sends initial state values for Metadata/User/Context to any registered observers.
      */
@@ -990,13 +1022,7 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
     @SuppressWarnings("rawtypes")
     @Nullable
     Plugin getPlugin(@NonNull Class clz) {
-        Set<Plugin> plugins = pluginClient.getPlugins();
-        for (Plugin plugin : plugins) {
-            if (plugin.getClass().equals(clz)) {
-                return plugin;
-            }
-        }
-        return null;
+        return pluginClient.findPlugin(clz);
     }
 
     Notifier getNotifier() {
@@ -1006,4 +1032,18 @@ public class Client implements MetadataAware, CallbackAware, UserAware {
     MetadataState getMetadataState() {
         return metadataState;
     }
+
+    void setAutoNotify(boolean autoNotify) {
+        pluginClient.setAutoNotify(this, autoNotify);
+
+        if (autoNotify) {
+            exceptionHandler.install();
+        } else {
+            exceptionHandler.uninstall();
+        }
+    }
+
+    void setAutoDetectAnrs(boolean autoDetectAnrs) {
+        pluginClient.setAutoDetectAnrs(this, autoDetectAnrs);
+    }
 }
diff --git a/app/src/main/java/com/bugsnag/android/ClientComponentCallbacks.kt b/app/src/main/java/com/bugsnag/android/ClientComponentCallbacks.kt
new file mode 100644
index 0000000000..74c2435598
--- /dev/null
+++ b/app/src/main/java/com/bugsnag/android/ClientComponentCallbacks.kt
@@ -0,0 +1,14 @@
+package com.bugsnag.android
+
+import android.content.ComponentCallbacks
+import android.content.res.Configuration
+
+internal class ClientComponentCallbacks(
+    val callback: (Boolean) -> Unit
+) : ComponentCallbacks {
+    override fun onConfigurationChanged(newConfig: Configuration) {}
+
+    override fun onLowMemory() {
+        callback(true)
+    }
+}
diff --git a/app/src/main/java/com/bugsnag/android/ClientObservable.kt b/app/src/main/java/com/bugsnag/android/ClientObservable.kt
index a654a54e24..88e97d745e 100644
--- a/app/src/main/java/com/bugsnag/android/ClientObservable.kt
+++ b/app/src/main/java/com/bugsnag/android/ClientObservable.kt
@@ -6,6 +6,10 @@ internal class ClientObservable : BaseObservable() {
         notifyObservers(StateEvent.UpdateOrientation(orientation))
     }
 
+    fun postMemoryTrimEvent(isLowMemory: Boolean) {
+        notifyObservers(StateEvent.UpdateMemoryTrimEvent(isLowMemory))
+    }
+
     fun postNdkInstall(conf: ImmutableConfig, lastRunInfoPath: String, consecutiveLaunchCrashes: Int) {
         notifyObservers(
             StateEvent.Install(
diff --git a/app/src/main/java/com/bugsnag/android/DeviceDataCollector.kt b/app/src/main/java/com/bugsnag/android/DeviceDataCollector.kt
index 98aecee197..2cd4795134 100644
--- a/app/src/main/java/com/bugsnag/android/DeviceDataCollector.kt
+++ b/app/src/main/java/com/bugsnag/android/DeviceDataCollector.kt
@@ -85,8 +85,7 @@ internal class DeviceDataCollector(
 
     fun getDeviceMetadata(): Map<String, Any?> {
         val map = HashMap<String, Any?>()
-        map["batteryLevel"] = getBatteryLevel()
-        map["charging"] = isCharging()
+        populateBatteryInfo(into = map)
         map["locationStatus"] = getLocationStatus()
         map["networkAccess"] = getNetworkAccess()
         map["brand"] = buildInfo.brand
@@ -126,41 +125,31 @@ internal class DeviceDataCollector(
     private fun getScreenDensityDpi(): Int? = displayMetrics?.densityDpi
 
     /**
-     * Get the current battery charge level, eg 0.3
+     * Populate the current Battery Info into the specified MutableMap
      */
-    private fun getBatteryLevel(): Float? {
+    private fun populateBatteryInfo(into: MutableMap<String, Any?>) {
         try {
             val ifilter = IntentFilter(Intent.ACTION_BATTERY_CHANGED)
             val batteryStatus = appContext.registerReceiverSafe(null, ifilter, logger)
 
             if (batteryStatus != null) {
-                return batteryStatus.getIntExtra(
-                    "level",
-                    -1
-                ) / batteryStatus.getIntExtra("scale", -1).toFloat()
-            }
-        } catch (exception: Exception) {
-            logger.w("Could not get batteryLevel")
-        }
-        return null
-    }
+                val level = batteryStatus.getIntExtra("level", -1)
+                val scale = batteryStatus.getIntExtra("scale", -1)
 
-    /**
-     * Is the device currently charging/full battery?
-     */
-    private fun isCharging(): Boolean? {
-        try {
-            val ifilter = IntentFilter(Intent.ACTION_BATTERY_CHANGED)
-            val batteryStatus = appContext.registerReceiverSafe(null, ifilter, logger)
+                if (level != -1 || scale != -1) {
+                    val batteryLevel: Float = level.toFloat() / scale.toFloat()
+                    into["batteryLevel"] = batteryLevel
+                }
 
-            if (batteryStatus != null) {
                 val status = batteryStatus.getIntExtra("status", -1)
-                return status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL
+                val charging =
+                    status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL
+
+                into["charging"] = charging
             }
         } catch (exception: Exception) {
-            logger.w("Could not get charging status")
+            logger.w("Could not get battery status")
         }
-        return null
     }
 
     /**
diff --git a/app/src/main/java/com/bugsnag/android/ExceptionHandler.java b/app/src/main/java/com/bugsnag/android/ExceptionHandler.java
index a10ee3f263..4e5f9beab9 100644
--- a/app/src/main/java/com/bugsnag/android/ExceptionHandler.java
+++ b/app/src/main/java/com/bugsnag/android/ExceptionHandler.java
@@ -23,9 +23,16 @@ class ExceptionHandler implements UncaughtExceptionHandler {
         this.client = client;
         this.logger = logger;
         this.originalHandler = Thread.getDefaultUncaughtExceptionHandler();
+    }
+
+    void install() {
         Thread.setDefaultUncaughtExceptionHandler(this);
     }
 
+    void uninstall() {
+        Thread.setDefaultUncaughtExceptionHandler(originalHandler);
+    }
+
     @Override
     public void uncaughtException(@NonNull Thread thread, @NonNull Throwable throwable) {
         boolean strictModeThrowable = strictModeHandler.isStrictModeThrowable(throwable);
diff --git a/app/src/main/java/com/bugsnag/android/LibraryLoader.java b/app/src/main/java/com/bugsnag/android/LibraryLoader.java
index f8dcb51a71..850a2f82c8 100644
--- a/app/src/main/java/com/bugsnag/android/LibraryLoader.java
+++ b/app/src/main/java/com/bugsnag/android/LibraryLoader.java
@@ -4,7 +4,8 @@ import java.util.concurrent.atomic.AtomicBoolean;
 
 class LibraryLoader {
 
-    private AtomicBoolean attemptedLoad = new AtomicBoolean();
+    private final AtomicBoolean attemptedLoad = new AtomicBoolean();
+    private boolean loaded = false;
 
     /**
      * Attempts to load a native library, returning false if the load was unsuccessful.
@@ -21,6 +22,7 @@ class LibraryLoader {
         if (!attemptedLoad.getAndSet(true)) {
             try {
                 System.loadLibrary(name);
+                loaded = true;
                 return true;
             } catch (UnsatisfiedLinkError error) {
                 client.notify(error, callback);
@@ -28,4 +30,8 @@ class LibraryLoader {
         }
         return false;
     }
+
+    boolean isLoaded() {
+        return loaded;
+    }
 }
diff --git a/app/src/main/java/com/bugsnag/android/NativeInterface.java b/app/src/main/java/com/bugsnag/android/NativeInterface.java
index 032f74bd3e..30e857b601 100644
--- a/app/src/main/java/com/bugsnag/android/NativeInterface.java
+++ b/app/src/main/java/com/bugsnag/android/NativeInterface.java
@@ -404,4 +404,24 @@ public class NativeInterface {
     public static Logger getLogger() {
         return getClient().getConfig().getLogger();
     }
+
+    /**
+     * Switches automatic error detection on/off after Bugsnag has initialized.
+     * This is required to support legacy functionality in Unity.
+     *
+     * @param autoNotify whether errors should be automatically detected.
+     */
+    public static void setAutoNotify(boolean autoNotify) {
+        getClient().setAutoNotify(autoNotify);
+    }
+
+    /**
+     * Switches automatic ANR detection on/off after Bugsnag has initialized.
+     * This is required to support legacy functionality in Unity.
+     *
+     * @param autoDetectAnrs whether ANRs should be automatically detected.
+     */
+    public static void setAutoDetectAnrs(boolean autoDetectAnrs) {
+        getClient().setAutoDetectAnrs(autoDetectAnrs);
+    }
 }
diff --git a/app/src/main/java/com/bugsnag/android/Notifier.kt b/app/src/main/java/com/bugsnag/android/Notifier.kt
index 339a01786b..6d02f69e7e 100644
--- a/app/src/main/java/com/bugsnag/android/Notifier.kt
+++ b/app/src/main/java/com/bugsnag/android/Notifier.kt
@@ -7,7 +7,7 @@ import java.io.IOException
  */
 class Notifier @JvmOverloads constructor(
     var name: String = "Android Bugsnag Notifier",
-    var version: String = "5.9.3",
+    var version: String = "5.9.4",
     var url: String = "https://bugsnag.com"
 ) : JsonStream.Streamable {
 
diff --git a/app/src/main/java/com/bugsnag/android/PluginClient.kt b/app/src/main/java/com/bugsnag/android/PluginClient.kt
index 8d3671ee42..d4b4f93127 100644
--- a/app/src/main/java/com/bugsnag/android/PluginClient.kt
+++ b/app/src/main/java/com/bugsnag/android/PluginClient.kt
@@ -2,11 +2,21 @@ package com.bugsnag.android
 
 internal class PluginClient(
     userPlugins: Set<Plugin>,
-    immutableConfig: ImmutableConfig,
+    private val immutableConfig: ImmutableConfig,
     private val logger: Logger
 ) {
 
-    protected val plugins: Set<Plugin>
+    companion object {
+        private const val NDK_PLUGIN = "com.bugsnag.android.NdkPlugin"
+        private const val ANR_PLUGIN = "com.bugsnag.android.AnrPlugin"
+        private const val RN_PLUGIN = "com.bugsnag.android.BugsnagReactNativePlugin"
+    }
+
+    private val plugins: Set<Plugin>
+
+    private val ndkPlugin = instantiatePlugin(NDK_PLUGIN)
+    private val anrPlugin = instantiatePlugin(ANR_PLUGIN)
+    private val rnPlugin = instantiatePlugin(RN_PLUGIN)
 
     init {
         val set = mutableSetOf<Plugin>()
@@ -14,13 +24,9 @@ internal class PluginClient(
 
         // instantiate ANR + NDK plugins by reflection as bugsnag-android-core has no
         // direct dependency on the artefacts
-        if (immutableConfig.enabledErrorTypes.ndkCrashes) {
-            instantiatePlugin("com.bugsnag.android.NdkPlugin")?.let { set.add(it) }
-        }
-        if (immutableConfig.enabledErrorTypes.anrs) {
-            instantiatePlugin("com.bugsnag.android.AnrPlugin")?.let { set.add(it) }
-        }
-        instantiatePlugin("com.bugsnag.android.BugsnagReactNativePlugin")?.let { set.add(it) }
+        ndkPlugin?.let(set::add)
+        anrPlugin?.let(set::add)
+        rnPlugin?.let(set::add)
         plugins = set.toSet()
     }
 
@@ -37,11 +43,51 @@ internal class PluginClient(
         }
     }
 
-    fun loadPlugins(client: Client) = plugins.forEach {
-        try {
-            it.load(client)
-        } catch (exc: Throwable) {
-            logger.e("Failed to load plugin $it, continuing with initialisation.", exc)
+    fun loadPlugins(client: Client) {
+        plugins.forEach { plugin ->
+            try {
+                loadPluginInternal(plugin, client)
+            } catch (exc: Throwable) {
+                logger.e("Failed to load plugin $plugin, continuing with initialisation.", exc)
+            }
+        }
+    }
+
+    fun setAutoNotify(client: Client, autoNotify: Boolean) {
+        setAutoDetectAnrs(client, autoNotify)
+
+        if (autoNotify) {
+            ndkPlugin?.load(client)
+        } else {
+            ndkPlugin?.unload()
+        }
+    }
+
+    fun setAutoDetectAnrs(client: Client, autoDetectAnrs: Boolean) {
+        if (autoDetectAnrs) {
+            anrPlugin?.load(client)
+        } else {
+            anrPlugin?.unload()
+        }
+    }
+
+    fun findPlugin(clz: Class<*>): Plugin? = plugins.find { it.javaClass == clz }
+
+    private fun loadPluginInternal(plugin: Plugin, client: Client) {
+        val name = plugin.javaClass.name
+        val errorTypes = immutableConfig.enabledErrorTypes
+
+        // only initialize NDK/ANR plugins if automatic detection enabled
+        if (name == NDK_PLUGIN) {
+            if (errorTypes.ndkCrashes) {
+                plugin.load(client)
+            }
+        } else if (name == ANR_PLUGIN) {
+            if (errorTypes.anrs) {
+                plugin.load(client)
+            }
+        } else {
+            plugin.load(client)
         }
     }
 }
diff --git a/app/src/main/java/com/bugsnag/android/SessionTracker.java b/app/src/main/java/com/bugsnag/android/SessionTracker.java
index b1ef742274..c02fdd3b51 100644
--- a/app/src/main/java/com/bugsnag/android/SessionTracker.java
+++ b/app/src/main/java/com/bugsnag/android/SessionTracker.java
@@ -369,21 +369,8 @@ class SessionTracker extends BaseObservable {
         return foregroundDetector.isInForeground();
     }
 
-    //FUTURE:SM This shouldnt be here
-    @Nullable
-    Long getDurationInForegroundMs(long nowMs) {
-        long durationMs = 0;
-        long sessionStartTimeMs = lastEnteredForegroundMs.get();
-
-        Boolean inForeground = isInForeground();
-
-        if (inForeground == null) {
-            return null;
-        }
-        if (inForeground && sessionStartTimeMs != 0) {
-            durationMs = nowMs - sessionStartTimeMs;
-        }
-        return durationMs > 0 ? durationMs : 0;
+    long getLastEnteredForegroundMs() {
+        return lastEnteredForegroundMs.get();
     }
 
     @Nullable
diff --git a/app/src/main/java/com/bugsnag/android/StateEvent.kt b/app/src/main/java/com/bugsnag/android/StateEvent.kt
index 8e53a58bfb..bc3c83e0ea 100644
--- a/app/src/main/java/com/bugsnag/android/StateEvent.kt
+++ b/app/src/main/java/com/bugsnag/android/StateEvent.kt
@@ -42,4 +42,6 @@ sealed class StateEvent {
     class UpdateOrientation(val orientation: String?) : StateEvent()
 
     class UpdateUser(val user: User) : StateEvent()
+
+    class UpdateMemoryTrimEvent(val isLowMemory: Boolean) : StateEvent()
 }