Ok, I have had a problem with my rear drivers side speakers ( door and third seat) cutting in and out on my 2009 GMC Acadia. It has the Bose 10 speaker system. When I turn the volume up they will cut back on but this does not last as they will cut out again later. I replaced the head unit, the speakers and the amp. This has not solved the problem. I am at my wits end with this! Does anyone have any idea what the problem could possibly be?