S21 Ultra and getting black screen on phone hang up

Verizon S21 Ultra
Been having this problem since I got the phone. Did a hard reset, no help.
WIFI calling disabled. Press Side Key to end calls is disabled.
Under Motions and Gestures: Lift to Wake, Keep screen on while viewing: enabled. Screen timeout 1 minute. Accidental touch protection enabled. Touch sensitivity disabled
So I will be on a call and after a few minutes I pull the phone away from my ear to hang up. But the screen is black.
I have to hit the side button to get the screen to reappear.

Please help!

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