Jerry,
If you're not logging out yourself, then it means that the "cookie" that the bulletin board writes to your PC hard drive indicating your login status is either getting corrupted or deleted.
I don't know how "cookies" get corrupted, but they will be deleted if you delete all the content in your Temporary Internet Files folder.
The only solution I know of is to:
<UL TYPE=SQUARE>
<LI> Log in by clicking the "login" link at the top left of the homepage.
<LI> Click "my profile" at the top of the page, then click "Delete All Cookies Set by This Forum".
<LI> Go back to the homepage and log in again.
[/list]
This process puts a new "cookie" on your PC and should solve the problem...until the cookie gets deleted or corrupted again.
Regards,
Chris