Thank you for the follow-up, Heghmoh. I also have ATT Fiber and could not even get passed POL yesterday on three different characters. Seems like it might be time to take a nice break and sub back in a few months.
Login to your gateway: Diagnostics -> Resets -> Reset Connect "Resetting your connection will re-establish your broadband connection."
And was able to get all my chars online
Modem:
Manufacturer ARRIS
Model Number BGW210-700
I have been online all morning and I was experiencing the same issue even logging into POL was getting all sorts of random messages, after doing this I could tell a difference right away just logging in, before even getting into the game, all chars on 4 hours, no DC's