[Open] - Mailbox ad icon disappears - Ads Not Working

Here’s a video showing mailbox not working properly(closing the app and opening again solves the problem).

https://youtu.be/jStsA3yFIAc

I will try to record another video of ads for reward bonus after completing mision. In that case the game gets frozen and forces the player to close it. Edit: In my case it gets frozen before it shows any ad, so I won’t be able to tell which is the ad that gives problem.