I bought a brand new logitech controller a couple weeks ago, and it would not sync to the receiver, so I returned it. I bought another brand new controller a few days ago, and it also won't connect to the receiver. what's odd is that both controllers will connect to my other logitech's receiver. there are no issues with lag or anything. does anyone know what could be wrong? my only theory is that the router is causing interference (2.4GHz), but why wouldn't that affect an older receiver?