I am also experiencing the same issue as the people above. Since installing the mobile authenticator I keep getting d/c every 30 mins or so. I am going to disable the authenticator to see if that solves the problem as mentioned in the post above.
Also, is there a way that you can save your “home” IP address so that you don’t have to use the authentication every time you log into the game. I liked the idea of the email authentication because you only had use it when you were logging in from a new IP address.