Iphone 17 promax restart itself

1. Follow the Apple article to resolve the issue --> If your iPhone, iPad, or iPod touch won't turn on or is frozen ...
2. If not resolved; please follow the steps in the following link for support with this issue: If your iOS device restarts or displays the Apple logo or a spinning gear unexpectedly
3. You still see a black screen after charging, force restarting, following the steps in this article.
   1. You see a black screen, but you can hear alerts, sounds, and vibrations.
   2. The screen remains black, but the device chirps when you unmute it and connect it to power.
   3. Your screen is on, but it doesn't respond when you tap, slide, or try other gestures. 
   4. You can't force your device to restart because a button is broken or stuck.
   5. Your device is stuck on the Apple logo, displays a solid color, or isn't recognized in iTunes.
   6. Contact Apple Support to set up service if you have any of the above issues:
4. Please follow the steps in the following Apple Video for support with this issue:

If none of the above steps resolve the issue, it is recommended to reach out to Apple Support or visit an authorized service center for further assistance. They can provide specific guidance based on your device model and iOS version.

A normal user like me does not want to know what these analytics/diagnostic data mean.

These are meant for diagnosis when the iPhone goes for service or repair at the Apple Authorised Service Center.

Check for Conflicting Apps: If the issue started recently after installing a new app, try uninstalling it and see if the problem persists.

While I wouldn't personally act on the Analytics report you provided, I encourage you to explore it for potential improvements. Taking this step is unlikely to have negative consequences and may boost your confidence. --> General Troubleshooting iPhone Issues: St… - Apple Community

This may help you --> Share analytics, diagnostics, and usage information with Apple

If you are experiencing some serious issue in the function of the iPhone then...

Take your device to an Apple Retail Store or Apple Authorized Service Provider, or contact Apple Support:

Apple Repair and Repair Status Check - Official Apple Support

Apple Authorized Service Provider

Find Locations - Location Selector - Apple

Contact Apple for support and service - Apple Support 

Alternatively, you may ...

Get a Genius Bar Reservation and Apple Support Options - Apple

Contact Genius Bar.

Manage Reservations - My Reservations - Apple

Are you running 26.3 beta? resprings may be part of that, in which case we cannot help.

If you are not yet on 26.2 then update.

Uninstall VPN if you have it.