Looping sound when leaving Spotify

[Dinedine]

Hey all.

I just updated my onplus 3 for the newest android version 8.0.0 

Now when I exit Spotify (still playing in back) the music will lope down in sound level, and a second or two after, go back to default. This also happens if Spotify is the running app, and I lock the phone. 

This is like a new kind of torture with the sound level going like a rollercoaster 

If any got suggestions I will accept them with the biggest smile