My xbox has recently become really weird. I only have 1 controller but it now thinks there are 2. And when they random controller shows up, the xbox constantly flips between the xbox menu (like pressing xbox logo on controller) and the shut off console screen. It will switch constantly back in forth every second till you shut it off. Then when you turn it back on, with either button or controller, the uknown controller (which there isn't one) comes up always as first and the actual controller and 2nd.