Unity Ads Stop Playing On Mobile

Hi There,

I am using Unity 5.6 with Unity's build in Ads Service. I am consistently running into the issue that when I publish my build on iOS, the ads will trigger and play perfectly fine a handful of times. Then they stop playing completely. It seems as if the Advertisement.IsReady() is returning false to cause this, but I am unsure as to why.

Here is my code:

  public void ShowRewardAd()
     {
         if(Advertisement.IsReady("rewardedVideo"))
         {
             scr_AudioManager.m_instance.PlaySFX(scr_AudioManager.m_instance.m_uiSelect);
             scr_PlayerPref_Manager.m_instance.SaveNumberOfRevives(scr_PlayerPref_Manager.m_instance.LoadNumberOfRevives() + 1);
             var options = new ShowOptions { resultCallback = HandleShowResult };
             bUpdateSlider = false; 
             Advertisement.Show("rewardedVideo", options);
         }
     }
 
     private void HandleShowResult(ShowResult result)
     {
         switch(result)
         {
             case ShowResult.Finished:
                 Debug.Log("The ad was successfully shown");
                 scr_GameState.m_instance.Revive();
                 Destroy(this.gameObject);
                 break;
             case ShowResult.Skipped:
                 Debug.Log("the ad was skipped");
                 break;
             case ShowResult.Failed:
                 Debug.LogError("the ad failed");
                 break;
         }
     }

Again, every time I publish the game to the App Store and download, the ads will play as intended about 4 or 5 times. Then they stop playing completely.

Any help figuring this out would be greatly appreciated.

Thanks a lot,

Eric