Bluetooth volume goes up and down randomly in my car

When I connect with Bluetooth in my 2016 Toyota Corolla, the volume starts out ok but then drops in volume to almost inaudible for a while and then later increases and drops down again. Is there a reason for this. It didn’t happen with my Samsung S7.

That could be a bug. Can you please install SW15 and try again.

I’d rather wait for the completely vetted version.