Every now and then, i log in OK, the screen appears that says "thank you for logging in [username]", but when it goes back to the homepage or i try to reply to a thread, i need to log in again as it says im not logged in. If i log in again and try to reply again, the same thing happens.

This has happened to me three times in the last month, has any1 else had these problems?

Its not a regular thing as i can do everything alright today, and its not my firewall cos thats also on now !!