So, the car is in the shop. Having this intermittent radio issue where a loud pop comes through the speakers and then the sound cuts completely for about 3 seconds then resumes. Mostly on long trips. Other forums mention a TSB (Tech Service Bulletin) related to an overheating amp issue but no specific numbers or replies indicating the issue was fixed under warranty. Question is, does anyone know of a specific TSB for this and have details I can share with my Service Advisor. I don't want to be a PITA and I am just establishing myself with the dealer so I don't want to press too hard, but I am already getting the "can't find any fault codes" spiel. Clearly it's a problem, and I'm not the only one with it, nothing more embarassing than taking folks for a drive in your M and having their ears blown out. Personally, I'd rather have the radio off and listen to the symphony of that V-8 but after a couple hours of that, passengers get bored.