For unknown reason, at random times, the radio/entertainment audio system will boost the volume to a distorted level, although the volume is NOT LOUD, it is at a normal level. It is apparently not speed compensation related, as turning it off or to any of the three speed levels, does not affect the distortion, nor does adjusting the volume.

The problem seems to just go away on its own within a few minutes. Happens when driving or just after a start, while sitting still, motor running. One cannot 'make' this happen, it is just random.