Why does my iPhone 16 Pro screen keep going black?

This has been happening several times per day: I am using my new (1 month old) iPhone 16 Pro when for no reason the screen will turn black. The phone is still on because I can still hear sound from the video I’m playing or the music I’m listening to. The volume buttons still work and if

I can restart the phone by pressing volume up, volume down, and holding the main button for about 15 seconds. The phone will then work normally for anywhere from a few minutes to a few hours before going black again.

I

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