Broken Iphone

You can try a clean install of your device after a factory reset:

First make sure you have a backup

How to back up your iPhone, iPad, and iPod touch - Apple Support

Then facory reset your device:

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

And set it up without a backup. See if the issue persists.

If it still does not work it is a hardware issue and will need service:

Contact Apple for support and service - Apple Support

If that solved it there was a software issue. Try restoring the backup and see if it still works.

if that made the problem come back the backup is the problem

Good luck!

Walton66 Said:

“Broken Iphone: I-phone pro max 12 keeps cutting on and off every 3 minutes”

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Getting Out of a Boot Loop:

Your iPhone is stuck in a boot loop. This typically happens when an update stalls while in the installation process.

So, refer to my User Tip: How to Fix an iPhone in a Boot Loop - Apple Support