I've had a log-in problem on and off for a while. Quite often when I search a question and see a thread that could give an answer, I get spontaneously logged-out either when I click on that thread to read it or if start to add a reply to the thread and have to log-back in (and find any text I had written gone forever). This only happens if I open a thread. If I just start my own thread without looking at any other, I stay logged-in.
Has anyone had this problem or is it a known issue?