It would have been moved to Technical Support due to the error you listed, Darbeezz.
Something is causing you to disconnect and get that error and it would help to troubleshoot the issue to maybe figure it out. Especially since you claim this is impacting only Horde characters and not Alliance, which seems to mean it is not specific to one character.
Beyond that, contacting our staff directly may help if the situation is specific to those characters.
Resetting your User Interface is the first recommended step in the Connection Troubleshooting Support Article.
Have you done that yet? Are you still experiencing an issue?