Over the past couple of months I have been having radio issues in my '12 SXT. At first the FM and AM stopped working but the Sat radio would still work. This morning went to leave for work and now the Sat doesn't work. When on any of those three modes, the volume knob on the radio and on the back of the steering wheel do not do anything. You can turn the know and press the button and the volume doesn't appear on the screen. Is this a sign that a new radio is needed?