(1) Try and Force Restart your iPhone EXACTLY as shown below and see whether that resolves the issue:
- Press and quickly release Volume UP button
- Press and quickly release Volume DOWN button
- Press and Hold the SIDE button until an Apple logo appears and then release the Side button (Can take up to 20 seconds. (DO NOT release Side Button when invited to Slide Power OFF).
(2) If the above does not work then - Check your screen protector performance and even the case. Remove both and see if that helps. Note that if you remove the screen protector then you may not be able to reuse it.
(3) If the above does not work then - See if your iPhone qualifies for the ➔ iPhone X Display Module Replacement Program.
(4) If none of the above help to resolve the issue - then please contact ➔ Apple Support
Axel F.