I don't get it. My connection is solid, it should stay on during inactivity for 60 minutes now, according to the preferences etc. But it just signs me out every 10 minutes or so for no apparent reason, and I don't see any way to fix it.

The same thing happened to me a while back...make sure you have the latest version of messenger downloaded...when I did..I haven't had a problem since. The latest version should be like 8.2 or 8.1 or something like that..dont download the beta version 9.0 because it's full of problems right now.