I was pulling my hair out trying to get media audio to stay connected on my S6 and Ford Sync audio system. I tried everything until I realized I had overlooked the obvious. Media audio would not stay connected, but call audio would. You have to select Bluetooth as the input on the Sync system. Only then will it say media audio connected on the phone and music will start playing assuming you have songs on the phone. So for those having trouble with media audio, make certain Bluetooth is selected on your car audio.
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Sent from my SAMSUNG-SM-G920A using Tapatalk