How do I stop ads interrupting my music player
Open the Google Settings app on your device (called Google Settings or Settings, depending on your device).
Scroll down and tap Google.
Tap Ads.
Turn on Opt out of interest-based ads or Opt out of Ads Personalization.
Reset the ad id, or user id.  

This is the only thing I've been able to find on the subject.  Like you, I run a background app while doing other things and, knock on plastic and glass, it seems to have worked
I have an S10+, but it should be the same on your note