This has been going on for quite awhile now and it's been ticking me off. I can't tell if it's an addon or not, but seems i'm not the only one who has this issue.
I play on Steam, and after a little while, game doesn't respond, eso mouse appears and then login screen. I try login again, Account Already Logged In. I wait a few seconds, Unidentified error. So it's forcing me to close the game at this point just to even get back in. It happens multiple times throughout the day if I were to play all day. I even deleted quite a few unimportant addons, outdated, etc. and it still happens. I had even reinstalled the game and still, it happens yet again.