Problem: According to Google policy, my app violates and needs to fix it before a certain date.
It is because of the interstitials launches when opening app.
Instead, It should be implemented at logical breaks in between your app’s content (e.g. pages, stages, or levels), so the user will not be confused since they are doing some action.
Solution: pre-load the interstitial in advance / Showing Interstitial Ads With Timer (in Splash Screen only)
Source in pdf