iPhone 8 malfunction after screen wake up

My iPhone 8 goes into a tizzy, with unstable and unresponsive screen, eventually crashing (resettable only by lock/unlock sequence) when the screen is woken up from a proximity sensor induced sleep.

While screen is dark in facial proximity during a call, audio functions continue normal. Conversely, screen and video functions work if screen sleep is not induced by proximity sensor. The malfunction is reliably repeatable.