Why i get constantly disconnects from the WOTLK servers?

In a 4 hour gaming session, i get 7-8 disconnects on avarage. Im able to log back instantly, but it get 5 try to load back my character, because it kick me back to the character chooser screen with "this character name is already exist" or "login failed". Theres no problme with my internet connections i have a 1000/300 Mbit/s otpical internet connections. And i have no such connection issues, only in Warmane wow server. In bunch of other private servers or original blizard servers, i havent got that problem. Pls help me, its so frustrating...

make sure that the realmlist is set to "set realmlist logon.warmane.com"

Other then that all I can think about is for or some reason, certain ISPs tend to have routing issues with Warmane. They are normally temporal. If that is your case, your alternative is to play with a Paid VPN.
Dont use a free VPN as the IP might already be banned.