I get logged off all the time Wedgie - like right now. I also have to log in twice most times for me to be truly logged in.
Just now when I got kicked out, I had just voted on your what do you think of the stars poll. My name was still shown down the bottom of the home page as logged in but I'm not. So I've just logged in and have lost all the View Posts Since Last Logged In which I use regularly here and on the Roost.
Speaking of which, I used to experience similar problems on the Roost but they went away....
One thing I did notice though is when I logged back in, the posts lost an hour of time. i.e. if I posted something at 10-30, it's now showing it posted at 9-30....