What web browser are you using?
I use Firefox, and my operating system is Win XP. I don't get logged off.
Maybe your cookie security settings are too high? Or have expirations? I am not certain... just throwing out some ideas off the top of my head.
Check Tools/Options and look for cookies (the cached information on your computer for websites like this one that use logins).
Sheeba - born 11/14/07 at 12:30 pm