At 10:05 PM MST on 2/22/2017 (12:05 AM EST on 2/23/2017) ESO was running fine and I logged out.
At 11:00 PM MST on the same day (1:00 AM EST on that day) ESO I restarted the game and logged in. I constantly received "Error 108 (7:5:315:0). Login Failed...." when I attempted to log back in. I saw no service alerts at
https://help.elderscrollsonline.com/app/answers/detail2/a_id/4320 for the PC (I use a PC to play). I had done nothing else with the PC (run no other applications).
I was able to log in to my account on the website, where I could entertain myself by reading all your useless, inapplicable help material. However, my website login did send me an email with an access code, because I was logging in from an unknown web address. I suspect my ISP, during that hour I was offline, changed my IP (they are prone to do that randomly). I suspect that has triggered some kind of failure condition in your launcher. Could you please fix that so I can play the game again???