About 2-4 weeks ago, display of metadata totaly messed up. When Spotify starts to play next song metadata displayed on car screen does not update at all. When I click "next" button on phone screen metadata does not update too. But when I click "Next" on steering wheel or car radio panel metadata update ... to previous played song. 

Correct metadata is displayed only when I start to play first song or on phone call ends. 

I have tried some tricks founded on forum:

 - switching off batery optimisation - no change

 - switching off display lock  - no change

Phone data:

OnePlus One, Android 6.0.1

I didn't update system since few months. Problem started about two Spotify updates ago.