Automatically logged out for no obvious or apparent reason.
So today I was clicking around the knex section as usual, when I got a message saying "Support DIY and Instructables today and go pro" or something like that. I'm already a pro member, so I reloaded my "you" page, and found out that I was mysteriously logged out of the system. I did not hit the "logout" button at any given point.
I did update Firefox to the newest version, but there was about a 10 minute interval between me starting up the latest version of the browser and the logout incident, during which I loaded about 5 pages, and it hasn't logged me out after past updates, so I'm not ready to rule that in as a possible cause. I did not clear my cookies or cache. It seems fine now, but it's still kinda odd this happened.