I had the same problem with my Galaxy Note 9 (pairing media audio to blue tooth in my 2012 Infiniti g37). After futile attempts by making changes in the phone (such as deleting the
Bluetooth memory cache) , I finally solved the problem by going into settings (in the Infiniti) ...going to Audio settings and designating the Note 9 as the audio source. I never had to do this with my previous phone a Galaxy 7 Edge. So , the problem was in the settings in the audio system IN THE CAR.
... View more