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Caddy and other GM products have been having this problem with their audio systems, and replacing the units with no pushback. I had a similar problem but with the interior door panel/handle of a grand cherokee a while back, and they replaced it with no pushback.
Looks like an older, common, problem, but my son's 05 is doing it also. 19,000 miles and still under warranty. I have a call into the dealer. I'll let you know the outcome.