Power button

Thank you for your reply

I can give you a temporary solution to your issue if the power button is running intermittently, by activating Assistive touch by going to settings >accessibility >touch >Assistive touch.

Then go back to the accessibility page > side button <side button confirmation and choose Enable Verification with Assistive touch. You will be asked to double-click the side button and will ask for the device password and you will be asked again to click twice on the side button and then you don’t need to click on the side button again

But remember this is a temporary solution and I advise you to go to the nearest Apple dealer to fix the problem for you.

Have a great day

Thank you for elaborating. This might be a hardware problem with your iPhone XS Max and not software. If you want, you can try restarting it and even going to the extreme of resetting/restoring your phone from a backup, but it might not be worth it if it is a hardware problem.

Hi

what is your iPhone

Are you holding down the power button AND the volume down button to power it off? Try that.