I was having repeated issues trying to log in on my main last night, sometimes getting bounced from title screen with 90002 or 2002 errors, and sometimes being bounced after selecting my main on Jenova and making it to the loading screen, then receiving a 10105 error. I was able to log in after approximately 40 minutes of this cycle by selecting a Japanese data center (Meteor) where I had no characters, fully exiting the game, then relaunching and selecting Aether, but I understand that this might be a fluke fix.