I am consistently having this issue as well. I seem to be able to reproduce it by zoning from one server to another when the receiving server is 1. going down. 2. Misconfigured (bad ports). You will disconnect and then never be able to reconnect. I have dug through the labyrinthine REdis DB, deleted ever likely local file, zone .ocean files. To no avail... The only resolution that I have found is to completely wipe the DB, of all references to the player char then the char will have to be recreated.
This issue is driving me nuts. I have a 15x15 ready to go except I can't support a player base if I can't reset stuck zoning characters.