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Intermittent Radio Buttons Not Responding - GMT900

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Within the past month, my 2011 Yukon SLT radio has been malfunctioning. I've seen several posts regarding the Nnv firmware but my truck does not have navigation. It does have the entertainment system. The issue involves the upper left control buttons (Info, first channel preset and Menu) and they stop responding completely. All of the other buttons work fine. After a day or sometimes even during a drive, the buttons will start working again. I haven't found any particular action that restores function.


I'm planning to schedule a warranty visit but knowing that the problem is intermittent, I'm anticipating it not happening during a brief diagnosis at the dealer so I'd like to track down the issue in advance.

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