BITOG seems to want a login from me around every 3-4 days. This is accessing the site through the 'https://' link, and going directly to the homepage of the forums.
It happens often enough I have to double-check my login status, otherwise I start browsing the forums, realising that I'm not being taken to the most recent posts - infuriating!
Still, the forum is otherwise great, and I really like the simplistic layout here. So nice compared to other forums.