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Hi and welcome to the King Community
Make also sure that the app is updated and also your Android system is updated to latest available version,
Check also that you have at least 2 GB of free memory on the device.
Unfortunately akafnulnu the issue of the screen turning black when playing an advert has been going on since December 2020. There is no harm in completing the actions recommended by Kiara, but due to the unresolved issue you may find that your screen still turns black.