Turn off your P2P programs on ALL PCs in your house. That would cause major network congestion and isn't friendly with EQ. Also, make sure you aren't running a firewall or installed any new antivirus or any other security software around the time that the problem started. Otherwise, give more info on your network and what hardware, connection setup, connection speed, and anything else you can think of.
You might want to test your connection speed at
www.dslreports.com and see what you get.