AdMob I'm seeing the same ads over and over again

Question

I have put an AdMob banner in my app and on my side (UK) I always see the exact same ads over and over.

When I open apps made from other dev with the exact same banner I see completely different ads. Moreover if I kill and reopen my app, the same ad that was there before killing the app is there now as well. If I do the same on these others app the ads are different, kind of they "shuffled" better.

The only thing I do my side is this on OnCreate:

 mAdView = (AdView) findViewById(R.id.adView);
 final AdRequest adRequest = new AdRequest.Builder().build();
 mAdView.loadAd(adRequest);

On the AdMob page I didn't rally really do any special a part from creating the adPlacement.

Is this normal? I have seen an "mediation" option on AdMob. I this something I want to use?

Answer 1

And this will be handled by the Admob. please keep the app alive for some time and check it . also refer this.

We recommend that you make ads persist for 60 seconds or longer, depending on the functionality of the app. Our internal tests have shown that this ensures users have enough time to engage with ads, providing the best performance.

If you choose to automatically refresh ads, make sure ad requests are not made when the screen is off. Also, if users navigate to and from pages with ads in an application over a short period of time, a new ad request should not be made sooner than the recommended 60 second rate.

refer this for more https://support.google.com/admob/answer/3245199?hl=en