Admob ads throws exoplayer initialize error and stop working after watching 15+ ads

[Jonathan Bellfontaine]

Basically, internally it throws an error. 

I am able to load ads but when RewardedAd is played, it doesn't show video and sound because of the exception thrown below:

This happens when you keep watching ads, possibly 15+ ads and then it starts to not play video and sound. 

[Lin Yang]

Hi, this group is limited to the AdMob APIs outlined in https://developers.google.com/admob/api. For SDK related questions, please post in https://groups.google.com/g/google-admob-ads-sdk.