This was driving me crazy and I think I finally figured out how to fix it! 1st thing to check, do you have another Xbox controller plugged in or connected to your Xbox? (charging or anything) if so be sure the other controller is unplugged and turned off, press the xbox guide button on your controller and take the battery out. Put the battery pack back in and turn on the controller and it SHOULD work now. It might take a couple of tries but this is way easier than logging out and logging back in