Updated FAQ

FAQ.md

@@ -1140,6 +1140,9 @@ See [here](https://support.google.com/mail/answer/7126229) for details.
 When using a Dovecot server,
 you might want to change the setting [mail_max_userip_connections](https://doc.dovecot.org/settings/dovecot_core_settings/#mail-max-userip-connections).
 
+Note that it will take the email server a while to discover broken connections, for example due to going out of range of a network,
+which means that effectively only half of the folder connections are available. For Gmail this would be just 7 connections.
+
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