You don't have a solid enough GROUND on the amplifier.
HHHMMM lets see kinow what could cause that??? Oh I know have you checked the B+ connections going to the stanby power as well as your always on wires?? Could also be a defective speaker or a wire touching in the car becaiuse as the volume rises the more voltage going to the speakers so the more of an overload on the out-put IC. The output IC could also bee defective. My money would be on a bad output ic or a bad speaker or wireing.
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