[Mister Moose]

What time period ae you experiencing this with? I notice if I take time thinking about a post, or get interrupted and come back to it, when I go to submit the post I was logged out. However, if you log in using that form presented it accepts the post. (Other forums I use don't do this, if you get logged out you lose the post.

So apparently there is a timer set on inactivity. Perhaps it could be reset by the webmaster to a longer interval.