When you focus out of the Minecraft window/screen, if you leave for more than 5 or so seconds you will be disconnected a couple seconds later.
This issue effects servers, peer to peer hosted servers and realms. There is no way to use another window to say reply to a message without being disconnected.
How to reproduce:
Join an online server, friend's peer to peer server or a realm
Tab out or focus on another window briefly (10 seconds will do it)
Open Minecraft and it will show you are disconnected soon after.
Related issues
duplicates
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