I had a similar problem in my wife's old car it was a 01 Saturn Sc2:lmfao:and everytime I would tighten the screws to secure the head unit the speakers would cut out. I was clueless...so I troubleshot like a MOFO. Come to find out a small part of a wire was exposed due to my tugging at the wires to tighen the zip tie that held the harness away from the A/c vent thingy. The tiny exposed wire was pressing up against some bare metal. It was a tight squeeze due to the motorized facepates huge harness. Anyway I heat shrinked the wire and Badda Bing problem solved. So might be a ground issue. :hsdunno: