Ok, so, this started as a minor problem. The website/forum went from remembering my login information indefinately and I didn't have to keep putting it in to logging me out every time I closed the current window, regardless of if I had clicked "remember me" when logging in.
However it's gotten much worse. If I don't post or navigate the forums within at least 15 minutes or so of my last action I get logged out. I haven't changed any settings. Can someone help me? This is frustrating, having to log in every half hour.