Updated FAQ

FAQ.md

@@ -740,19 +740,20 @@ Mobile connections are almost always metered and some (paid) Wi-Fi hotspots are
 Possible causes of messages not being synchronized (sent or received) are:
 
 * The account or folder(s) are not set to synchronize
-* The number of days to synchronize is set too low
+* The number of days to synchronize message for is set too low
 * There is no usable internet connection
 * The email server is temporarily not available
 * Android stopped the synchronization service
 
-So, check your account and folder settings and check if the accounts/folders are connected (see the legend menu for the meaning of the icons).
+So, check your account and folder settings and check if the accounts/folders are connected (see the legend in the navigation menu for the meaning of the icons).
+
+If there are any error messages, please see [this FAQ](#user-content-faq22).
 
 On some devices, where there are lots of applications competing for memory, Android may stop the synchronization service as a last resort.
-Some Android versions,
+
-in particular of Huawei (see [here](https://www.forbes.com/sites/bensin/2016/07/04/push-notifications-not-coming-through-to-your-huawei-phone-heres-how-to-fix-it/) for a fix)
+Some Android versions stop apps and services too aggressively. See [this dedicated website](https://dontkillmyapp.com/) for more information.
-or Xiaomi (see [here](https://www.forbes.com/sites/bensin/2016/11/17/how-to-fix-push-notifications-on-xiaomis-miui-8-for-real/) for a fix)
+
-stop apps and services too aggressively.
+Disabling battery optimizations (setup step 4) reduces the chance Android will stop the synchronization service.
-See also [this dedicated website](https://dontkillmyapp.com/).
 
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