I have an app in playstore. The app contains two ads(Banner and Interstitial). The app published almost 2 months ago. Test ads work fine. Ads were working well in the early days. But now real ads are showing sometimes but sometimes not showing. I'm checking the app many times in the day(Never clicked ads). I couldn't find any problem like this when i search at internet. What can be the problem ? Thanks in advance.
If you are receiving testing ads, but not real ads, then your implementation for ads is all okay.
Admob is very poor in providing ads. So I suggest you to add other ads networks too if one of network is failed to provide ads.(E.g. Facebook, StartApp, AppLovin etc.)