I am on a residential US IP that seems to have a good reputation when I checked. As of a few days ago I got logged out and login page wouldn't load, saying "Sorry.".
Today frontpage started to say the same. I figured I'll test from a different IP and even login worked.
Seems like the some mistake might have led to some potentially incorrect ranges getting blocked.
@dang, for reference, it is the IP that ends with 109.205