This actually happens every single 1st day of the month... It's a forumotion thing they do to ensure the safety of every one's profiles so no one is permanently logged in forever... However, it does seem to be a bug that you have to do it repeatedly (aka every time you visit the site through out the day)
We've announced it in the past, but we have been open since June, so it's a bit more known (at least we hope people read the small announcements we have made about it)