Music paused every few minutes Bluetooth car connection

Hi. 

Only in my car (Lexus is300h) when I use Tidal via Bluetooth Music paused every few minutes and I see in the car’s screen input changes to radio. The Tidal music appears automatically again after a few minutes.

tried restarting both the iPhone and the radio, then forgetting the device and pairing it again.

still an issue.

The only change I’ve made is iPhone software update.

I'm now with the latest iOS version

please advise

thanks