I have this strange problem with the head unit: Once every fortnight or so the radio starts with extremely high volume and a lot of distortion when i start the car.

If i turn it off and back on again by pushing the volume knob, it is still the same, but if i cut the engine and start it again, the sound level pops back to normal levels. I have "ignition logic" on.

I had it checked once during the warranty period, but the dealer said "nothing wrong with it", the fault of course didnt reveal itself.

Anyone else out there had this problem?