Why does my car bluetooth drop out constantly?

Spotify does pause if it's not a downloaded track and you lose coverage but it's been a while since it happened to me, can't remember if it starts playing again by itself or not. It was happening to me even in coverage when the sound quality was set to high, but mobile network seemed to be slow that day in general.

Usually Bluetooth is pretty solid once connected. Doubt it's your stereo if it's happening with two of them. Try testing with downloaded songs.

Father in law has a Nissan NV400 (is that your van?) and something goes wrong with his Bluetooth connection every couple of days, I get called out to delete and re-pair the connection. It's driving me mad. I'll be interested to see if you figure it out.

If you were to park-up in either vehicle in your driveway running purely from WiFi from the home to your mobile does the same thing happen? That if no issue would point to mobile data problem.