I've also been having this issue for 2 weeks now. Released/renewed IP address, changed DSN, changed router, talked to ISP, nothing helps. It seems to be affecting my main char the most. Sometimes it takes an act of god just to get through the POL screens, other times I can get into game, but R0, d/c, get stuck in black "downloading data" screen, etc.
Not even using a VPN helps now. The VPN seems to help quite a bit getting to log in, but then I still get stuck at "downloading data" screen again, and can't even log in. The only way to get me unstuck is to have a friend log in and zone my char before I can get back in, but then it's just a matter of time before it happens again.
Some of the users I've seen seem to have similar regional ISP's, but I'm in North Dakota, nowhere near most of the reports I've seen, and have been using the same ISP for 5 year now without issue. This is absolutely an SE server issue, and it's complete nonsense. The game is literally unplayable right now.