Xbox controller

If a new controller didn't fix the problem your problem is probably in the console itself. Have you tried connecting the controeler to a different port on your console?

Also, if you're using an extension cable try not using it to rule out this as the cause of your problem.

If you have done any modifications to your console (a.k.a. chipping it) this might be the source of your problem. Try disabling or uninstalling the mod-chip to see if your problem will go away.

-Chris