Every time I close an ad a new one appears?
The reason for this was incorrect implementation. You left appmediation auto load feature enabled (it loads new ad when old one is closed) and set ads to be displayed right away once they are ready.
Solution: How to use auto load feature?
https://appmediation.com/android-sdk-documentation/#4.2
and manual load feature (in this example it is for interstitial)
https://appmediation.com/android-sdk-documentation/#3.7.2.2
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