Just adding my woes here. I have an '06 that right out of the gate had problems and I have replaced the Shaker 500 SEVERAL times all to no avail. The problems are varied and I have even resorted to using only store bought CDs to see if that helps. Ford says it's a problem identified with Delphi and that I have to keep swapping units until I find one that works.. Glad it's under warranty.