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I forgot to follow up to this post, and your comment reminded me to do just that. I took the car to a radio/electronics specialist in the area who let me know that they could trace the wiring harness and hopefully find the issue. Starting from the amp in the back they roved the seats and carpet and followed the wires to the dash. Under the center console by the shifter/cupholder the connector had come apart a bit. They put it back together and added a ziptie. But, yes, it sounds like the same thing that was causing your issue!