Display freezing

Restart your iPhone or iPad. Make sure that your screen is clean and free of any debris or water. Disconnect any Lightning or USB-C accessories. If your screen works after removing an accessory, try using a different outlet, cable, or charger.

If the screen isn't working on your iPhone or iPad

I am having this, too, at least 1-2 times daily. Occurs with and without my phone (14 Pro) being plugged in and a clean screen. It is not limited to one app (can happen with several). Restarts have not helped and I've removed and cleaned my phone from its case (Apple silicone).