Had the same problem, seemed to start after that last big patch, sent many emails to SoE, went to the live chat tech support, Finally called tech support, nothing worked. Called Belkin Tech support (the worst) was on hold for 2 hours got no where !
Switched to a Linksys router and havent had a problem since.
You need a new router !
I think the game EQ II is NOT compatabile with certain routers and/or older models of routers. The big patch seemed to do that.