I've experienced being booted for being idle for too long when I was only idle for a few minutes (like, five). I double-checked the settings and it's set to a full 30 minutes, much longer than it seems like I waited.

 

This issue is now being reported by the users. They're not chatting anymore, and this auto-logoff thing while someone "holds the room" is killing the chat feature.

 

 

Using the Nov 12 build.