This has been a bug that has affected me since either patch 8.25 or 8.3, I’m pretty sure it’s been since 8.25. CERTAIN characters sometimes I will get disconnected as soon as I log in and it shows the error WOW51900319. When I would exit the game and re-log into the game, if I tried to log into any of these characters, I would get immediately disconnected again. EVERY time I would try to log into these characters, I would immediately get disconnected after the loading screen finished.
I have followed all the steps on the support page for that error in the past and nothing has fixed it.
The character disconnect seemed to almost exclusively affect my level 120 characters (now level 50). Resetting my UI, resetting my ip address, releasing and reacquiring my DNS, etc, would NOT make this error go away. Often times, I would wait 5 minutes, 10 minutes, 15 minutes or more before trying to log in again, but these characters would still get disconnected.
Eventually the ONLY thing I found that would work TEMPORARILY, would be to log into and then log out from 3 different low level characters, and THEN try to log into the level 120 character (now level 50) I was trying to play. Then, I would be able to log into the max level character successfully without getting disconnected. Sometimes, I could get away with logging into only 2 low level characters, but MOST of the time I would still get disconnected. Also occasionally logging into and out of 3 low level characters was insufficient and I would rarely have to cycle through 4 or more low level characters before the game would let me log into my max level characters without INSTANTLY getting disconnected. I also found that RARELY, I would get disconnected from some level 80 characters I rarely play (which I had locked experience for because I wanted to gear for Herald of the Titans).
Last night and tonight I have been continually cycling through low level characters, and sometimes spending 15-30 minutes on the low level characters, but the game was still disconnecting me from my high level characters, but I think I have found the ONE pattern that links my max level characters, and occasional high level, but not max level characters - - I believe the ONLY characters that have ever experienced this disconnect on login bug are characters that are all flagged for WARMODE. Last night even this frustrating process of logging into and out of 3 low level characters + giving it time was not working and the game was not letting me into my max level characters I was actually trying to play. It took over an hour before I could get on ONE of my max level characters to play.
This morning I have spent over and hour and a half and the game has not yet let me log into any of these (Warmode-flagged) max level characters that I am trying to play without being instantly disconnected the moment the loading screen finishes, no matter how long I wait and no matter how many low level (non-warmode) characters I log into.
This is a SEVERE PROBLEM that has been going on for almost a year or more and has only gotten progressively worse. THIS NEEDS TO BE FIXED.