Are the vids ok for your Android device ?
If yes, consider a check of the apple device ( try watching ads in another game for example ), and see if the issue remains.
Another thing you can check is, if you have/had an OS update/upgrade soon.
After that we ... possibly can "track" some other elements... if ofcourse, the admins allow it.
That being said, the method which you can use is "on the edge of illegal" so to speak, but the idea is to find the problem causing this issue.