xxgary81xx

Lately when I turn on my car my car stereo will not play any music. If I put the car in ACC mode it will play with no issue, radio and bluetooth. After driving for about 15 minutes the stereo will then play music. I purchased a pioneer touch screen head unit 2.5 years ago from best buy and went there last week. They said everything is plugged in perfectly and nothing looks out of the ordinary. They gave the unit a reset and that did not fix the issue. I have an extended warranty with Nissan, but I know 100% the dealership will blame it on the stereo. What could cause an issue like this? I was thinking maybe the extreme cold our there but why would it work in ACC mode? Any suggestions, I dont feel like dealing with a bunch of ******** at the dealership. That's my last resort