This may sound crazy, but I think my friend made me lag. I played Halo 3 with him one day and everything went fine. But eventually everything started lagging. Ever since then, I haven't been able to play one game without any lag. I've tried restarting my router, clearing my Xbox cache, and some other things. None of those worked, so I am coming to you, the members of Se7enSins. P.S. I have Comcast.