I travel for business a lot so I'm *always* in tons of random rental cars.. While most have streaming BT functionality - a LOT of them I get the same issues you guys are discussing on my iPhone 7.. I'll get my single iTunes song to start playing upon connection (which is some awful old Run DMC song), then sometimes it will kick over a podcast, then if I switch to Spotify I'll get one of any of the previously mentioned controls for the screen. Even brand new 2017 models with streaming BT built in still has a lot of these challenges. I'd guess it's phone related and less BT connector related.
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