Screen continuously goes black during call??

Has anyone noticed that when you’re on a call and you take it away from your phone to put it on speaker it’s nearly impossible? The screen goes black over and over again and doesn’t let you do anything on the screen. Is there a way to fix this? I read somewhere that it’s possible it thinks your finer is your ear so it’s locking it to avoid hitting buttons.. but I put almost every call on speaker or need to change Bluetooth settings.

Fixes online have just restart or turn off reduce motion which doesn’t seem like an actually fix