For me Bluetooth in my BMW is poor. Had no issues with Pie, but Android 10 is poor. Media audio quits playing all the time and the only fix is a phone reboot. Yes, I've unpaired /paired phone again. No help. I'm rebooting phone 2-3 times per day to restore audio in my car. Again, never an issue before Android 10. And I have the latest software on my BMW idrive. It's a 2019 just produced in May 2019.
Try and get it to do it when you are parked, then report it to Samsung so it will generate the logs. Hope they can get it fixed for you with the next update!!
Maybe the app is going into sleep mode. Go to settings, device care, battery, app power management, sleeping apps, select trash bin and them select your music app. this will eliminate the app going into sleep or hibernation
