Note that a Force ReStart does NOT involve sliding that button to turn off the iPhone A Force ReStart actually tells you to ignore that slide button OFF request and continue holding the Side Button.
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).
Axel F.