When you log in, do you check the box that says [something like] "Keep me checked in"? (I don't remember exactly, because I checked it so I never see it.)
If you don't check that box, the software will automatically log you off after a certain period of inactivity. It's not a long period ... and if you have an edit window open and you spend any significant amount of time composing your message, the system sees that as inactivity because you didn't interact with it, so it logs you off.
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