I was still getting logged out at work today.
It happens pretty randomly, but I think it happens to me more when I'm trying to post. I hit the post button, it says my session timed out, and to try to repost. Then it logs me out after I hit "post" for the second time, and I get the message,"you can't post here if you're not a member, sign in or create an account" and when I sign in, I get three red error messages above an empty post box saying my session timed out, try to re-post, adn message field left blank.
It's especially annoying since I have to log in again and then lost my entire post. But over all, it does seem to be happening less than last week.