This happened to me some couple times. While I enter a portal or try to go to other location the game disconnect , and when I try to enter that character it doesn’t enter. It looks like it got stuck between two locations.
Of course the other characters are working fine. I fixed this problem before by trying to enter the character that had the problem and after a lot of attempts it eventfully enters by luck.
I think if I can change the character’s location without entering it, it will solve the problem, but is that even possible? Is there any other solutions?