Ok, I've been into car audio for the past 10 years and I have never come accross this problem. Head unit: Pioneer Premier PDH840. I installed this unit in my car a few weeks ago and it worked just fine. I only have two cerwin vega 6 1/2's in the doors for now because thats all I had time to do. Everything was working fine. I've worked in car audio doing custom installations, fiberglass work, system building, and troubleshooting for years, so the deck is installed properly. I was out for a ride one night and everything was still working great. Woke up the next morning turned on my car, tried to turn up the volume and heard a large crackle in my left speaker and my right speaker was so distorted I could barely hear it. I panned it all the way to the right and it sounded the same (completely distorted, no volume). Panned it all the way to the left, and the left speaker went almost completely back to normal. Panned it back to the center and it was crappy again. Couldnt get it to go normal again. Took the deck out to see if any connections were loose...none loose. Any bare wires shorting eachother out...none. Put deck back in. Went under the hood and disconnected battery, then re-connected. Turned on car, DECK WORKS FINE!!!. Drive it all day and no problems. Went to go start car next morning, SAME PROBLEM!!!!! Re-checked all connections......power..OK, Ground....Perfect. Everything else...perfect. I dunno guys......heard of this one before? Time to get some Pioneer warranty service or what?? Any suggestions??? Install Deck. Deck work fine. Next morning, speakers start distorting, right speak extremely distorted. pan to right, all distortion. Pan to left, speaker sounds just fine. bring into center, both sound like crap. Check connections, all good. Unplug battery, system resets, deck works fine. Next day SAME THING HAPPENS! This is almost as scary as playing naked water twister with the Golden Girls. Any help is appreciated.