I am having the same problem. When I updated to android 9 and Samsung one ui on my S9+ that's where it all started. After that update I lost all metadata on my car with bluetooth, I tried it in a few other cars and it seemed to work just not with mine for some reason. I drive a 2013 Audi S4 for reference. I got the Galaxy S10+ and had Hopes that the problem was fixed. I connected to my car and same thing, no metadata and music would stop playing randomly after screen turns off and then would resume when I wake the screen. Also am no longer able to skip or pause tracks from the button on my steering wheel or the skip button on my phone on the lock screen. I have to unlock my phone open spotify and open the song playing to have any control. Maybe it's an issue with spotify and it's not fully compatible with the phones latest updates? I am also having the same problem with all music streaming apps and even music that is downloaded directly to my phone so it can't just be spotify. I hope Samsung can put out a fix for this.
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