Cant log in on any character that is on the Dragon Isles?

Just returning to the game. Last played on Dragon Flight exp and trying to log into my Lvl 70 character who is currently still on the Dragon Isles. After choosing him it tries to start the game and disconnect with a WOW5190322 streaming error? Any character not on Dragon Isles is absolutely fine… unless I send them to the Waking Shores then they cant log in either!! Any advice? Ticket has been submitted but not resolved issue yet.