As per the title, I keep finding myself having been logged out of the sites. As best as I can remember, once each on SU and Meta, twice each on SF and SO. This problem here was fixed, so I'm not sure if they're doing updates or there is some larger problem.
I use Google for OpenID, and Firefox 3.6 for the browser.
Edit: I just got another logout on SU, @12:43 pm.
Edit: SF, 1:23 pm. Edit: Logged out one more time on SO & SU. I've now done a complete restart and CCcleaned everything, so we'll see how it goes.
Edit: After the cleanup, and giving it a day, no problem. So just another unsolveable mystery bug. I'll vote to close as no longer relevant.