One Character Keep disconnecting (WOW51900319)

I am getting immediately “disconnected after just 2 seconds” of being logged in. This only happens on “One Character” where I get the error: (WOW51900319)

This also happens on the same character on 3 other computers, and 1 other computer that is in another location with a faster network connection.

If I log into “any” other character on my account I stay logged in and can play all night. It is only the one character that gives this repeatable error after 2 seconds of being logged in.

I have tried doing the character move, and no joy. Has anyone else seen this issue?

-DB