Still having issues with my bluetooth, but my issue seems to be very specifically related to my phone and watch. Back when the new iPhones and watches came out, I upgraded both...got a new iPhone 11 Pro and an Apple Watch 5. Immediately had bluetooth issues in my Acura, most of the time the connection will be unstable and disconnect/reconnect at the beginning of each song, as the playlist starts each new track. One day I left the house without my watch, and somehow the dropouts stopped. On my commute the next day I tested by turning my AW off and on, sure enough when it's off there's no drop outs. They come back when it's on. So somehow, the BT connection to the watch is interfering with the BT connection to my car. Super annoying. I have reported the issue to Apple, all I can do is hope it gets fixed in future updates but I have no idea if the issue is WatchOS or iOS...