Black screen problem on OnePlus 7 pro after update

I discovered my screen went black after oxygen update. I tried safe mode and factory reset to no avail. I now used to press volume up + power switch to restart to use set. Once the sleep time elapsed or I tapped the power button, it goes black and I hv to go through same process to restart before using phone. While in black screen, I cannot pick up call or see who is calling until I restart phone as explain above.

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