I have a Galaxy S9 and my issue just started today. My phone will connect to my car via bluetooth, but continues to disconnect and reconnect. Eventually, I get a message on my phone stating "Bluetooth app keeps stopping."
I've cleared the cache and reset my car connection and that does not work.
restart your phone and try again
1. have you updated you phone to the latest software?
2. reset your phone into safe mode, then try again. 3rd party apps accessing Bluetooth could be interfering
3. ask reddit