Something funky started going on just now where I'm constantly having to re-log in, and whenever I change pages (such as clicking a subforum or thread) then I'm logged out again. For example, in order to post this thread, I had to:
1) Log in
2) Go to this subforum
3) Log in
4) Click "New Discussion"
5) Log in
6) Write this post
To troubleshoot, I deleted all my cookies and ran CCleaner, and still had the same issue. Not sure if it's specific to me, but thought I'd report it just in case.
However, immediately after starting this thread, the problem went away and has not been seen since. Might be one of those fluke things - if so, apologies for wasting everyone's time!