Sound was muted forever after minimize app while watching Admob interstitial ad

Hello,

I have a problem with unity sound on iOS.
When my game starting playing an AdMob interstitial ad, I minimize it then re-open again. This will cause the interstitial ad closed automatically, but will also make my game muted forever. No sound playing then.
If I minimize the game again, and re-open it, the sound system is back (with the strange behavior that all muted sounds before will be playing at the same time).

Although this is random, but it's quite easy to reproduce.
I see this problem on my 2 games. I'm using Unity 2018.4.16f1.

Could you please help?
Thank you.

 

Have you submitted a bug report to Unity? Just posting on the forum rarely gets attention.

 

Same problem i have and couldnt find solution.

 

void OnApplicationPause(bool pauseStatus)

    {

        MobileAds.SetApplicationVolume(pauseStatus? 0f : 0.5f);

    }

 

que se debe de hacer