There are videos that show resetting the radio through your on screen settings menu. Restart options, restart in safe mode. That has worked for all of them. I have not tried this yet, but I know the reset with the "hangup" button has not ever worked for me. It reset the radio, but still no sound. Safe mode has seemed to work for the rest of them that have tried it. I hope GM gets this fixed. Very frustrating that you pay this much money for a truck with this issue. They need to understand, too, that this is a safety issue. When you loose sound, you also have no bluetooth. Is GM going to pay the ticket when you have to grab your phone because you can't hear anything from your vehicle?