I also have had a post for the last day 1/2 and no reply as of yet if you find a solution please post it here! I'm Looking!
Can you go to the System menu on the login page, and here lower the Water Details option?
Then see what happens.
If you still get disconnected, can you also check the configuration of your network adapter:
please suggest another "fix"
No mods used other than wowheads.