This is probably the strangest thing I've ever heard from a car stereo. My wife's car recently started experiencing a speed sensitive radio wobble.
Regardless of what she's listening to, FM/AM, CD or Aux input it all sounds the same. If the radio is on and the car is not moving, then there's no sound OR the radio works perfectly. Then you move maybe 3 feet and the stereo volume turns off. As one accelerates this cycle increases and the radio sound comes in and out faster, like an intermittent bad ground but without the bad ground whine. Is there some other device on the same circuit that could be effecting the radio? I'm totally clueless. Has anyone experienced this?? Please help and thanks.