My mustang does the same thing. In my case, the 6 disc CD changer is spinning from chamber to chamber, loading and unloading cd's all night. I thought I had fixed it by taking all the cd's out but yesterday morning when I got in it, I could hear the motor to the changer running....barely. The battery was so low that it was having a hard time running. Ofcoarse, the car wouldn't start and the battery had to be replaced. I sprayed some contact cleaner in the cd slot and hopefully that has fixed it??