iPhone 13 crashes and reboots

You may have a failing battery, if the battery is not capable of outputting the proper current needed to run the phone, these types of issues can happen.

Batteries degrade over time with usage due to chemical aging.

You can expect about a 1% drop per month with average use on an iPhone. This is an approximation, that is why it may be plus or minus a few percent on a month to month basis.

Apple recommends replacing it when the health level reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.

iPhone Battery Replacement.

iPhone Battery Replacement - Apple Support

About Lithium Ion Batteries

iPhone battery and performance - Apple Support (IN)

I can’t quite know what the issue is from only that information, but I can demonstrate on how to view these files. From what I found, those different file types correspond to different logs:

Kernel - System crashes or errors

GFX (Graphics) - iPhone display or GPU-related issues

AOP (Always On Processor) - background processing activities

There might be a plethora of file types, so I would recommend forensic analysis tools, which are made for these types of sysdiagnose logs, such as MOBILedit Forensic. But if you aren’t used to using these diagnostic files/software, you can reach out to apple support and send the sysdiagnose file to them if needed. Hope this helps!