I'm not sure if this is related to a software update don my galaxy s8+ or a developing issue with the car. BT audio is not working ... unpaired/paired several times to get it working again. Then I noticed I'm not get SMS text notifications anymore and cannot get this working for nothing. Now my BT audio is gone again. I see batt at signal status displaying but everything else not working.

 

Try deleting the phone and repairing it. I had to do that with my iOS device.