Hi guys,
I`ve just fitted a Pioneer head unit to my 520i, and have a slight but very annoying problem. The moment i hit 50 mph or 80 kmh, the head unit looses the ower supply, and shuts off. I slow down and all goes back to normal. I`ve checked the fuses and all is good. The car is not fitted with an amp, and i have no intentions to fit one either. Is there a sensor for outside noise that might have an effect?
Any ideas?

Thanks, and happy beeming
M