Mine does this also. I've double checked everything. I've tried different ground locations. I've tried conecting directly to the batery. When I mesure the voltage, I get 12.6v and when I step on the brakes it only goes down to 12.3v. Heck the voltage drops down lower when I hit the headlights and has no effect on the player. The power windows are the same deal. The voltage drops when the windows are raised and lowerd, and still has no effect on the player. My last resort may be using a big cap next to the unit.