Phone restarting itself

(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 - Follow the instructions in this article by Apple ➔ If your iPhone is Non-Responsive or Frozen and see if that helps.

Axel F.

AnnaW22 Said:

"Phone restarting itself: Why do my phone keep restarting itself?"

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Troubleshooting an iPhone in a Boot Loop:

Your iPhone seems to be stuck in a Boot Loop. This typically occurs when you were updating something, and it was unsuccessful. So, to fix this, use my User Tip: How to Fix an iPhone in a Boot Loop - User Tip