If your server was working fine before Dtv install, and you haven't changed your server configuration, then it's most likely having Dtv or they messed up something during the install.
Try running tracert a few times to www.eqemulator.net
and see what kind of ping times you're getting along the way.
I don't know where to go to check for UDP packet loss, but you could look around and see.
Are you running windows? Try a full virus scan..I just heard about a virus that can defeat digital signatures.
What's the name of your power company ISP and what state do you live in? I'll look around and see if other people are having similar issues with their internet connection using this combo.