I purchased an 07 Mustang and am having problems with the Shaker 500 system. It works fine while I am listening to it, but when I shut the car off and then after awhile start it back up with the system running, the CD player will continuously search for a CD and eventually after not finding it (there are 6 in the player), it will shut off. If I hit the power button while the CD is searching, the radio will come on and play over the top of the CD while it's searching. I have had it replaced twice now and Ford is telling me they have not heard of this problem...ANYONE OUT THERE THAT HAS?