Random faults on your smartphone might create power difficulties, which could be why your iPhone X keeps going off. Simple methods may be ineffective in removing this problem, and you'll need a sophisticated approach to deal with it. Using iTunes to do a recovery mode restoration will allow you to restore the iOS, erasing any issues caused by a defective update. Just make sure you have the most recent version of iTunes installed on your Mac or Windows computer. Execute the following steps once you're ready:

1. Connect your iPhone X to your computer using the included USB/Lightning connector, then launch iTunes on your PC.
2. Quickly press and release the Volume Up button.
3. Quickly press and release the Volume down button.
4. Then tap and hold the Side button until your phone displays Recovery Mode. If you see the Apple logo screen, don't release the Side button since you'll need to enter recovery mode to restore your iPhone.
5. When iTunes asks if you want to Restore or Update, choose Restore. This will allow iTunes to download your device's software. If the download takes more than 15 minutes, your phone will exit recovery mode. If this occurs, simply repeat the instructions to re-enter recovery mode.