My phone restarts itself

I trimmed your panic log information down to just what we need. Based on the information contained, it's telling us you have an iPhone 14 Pro Max. The sensor array error code it's calling out is 0x20000; cross referencing that with the SMC Panic Assertion wiki page, that tells us the issue is with the gyroscope on your phone. You can see that information here.

iPhone SMC Panic Assert

The bad news is that there's a note indicating the gyroscope is located on the bottom board, meaning it's the lower one of the sandwich pair making up the motherboard. In order to even get to it, you have to disassemble the motherboard into separate boards, then use very fine microsoldering skills to replace or repair the gyroscope chip.

Obviously not something a home DIY is going to be able to fix; this requires very specialized expertise and equipment.

@flannelist, Alisha, have I got anything wrong here?

We've seen this issue only a couple of times, and unfortunately we don't have a good idea of what's going on here. The term SOCD would seem to indicate the System On a Chip Daemon, a watchdog task that runs periodically to verify the processor is still running. At some point it found that the system was not functioning correctly and rebooted the phone to try and recover.

This would seem to be a software issue on the surface, although we can't entirely rule out that it could be hardware-related. As such, updating the OS should be the first thing to try, followed by a full factory reset, preferably using DFU mode (look that up). Once it's been reset, DO NOT restore your backup before checking thoroughly that the issue is gone. It's possible a corrupted piece of software or file could get restored with your backup, effectively reinstalling the problem.

If neither of those suggestions help, then it becomes more likely that you're seeing a hardware issue.

Try them out, then come back and let us know what you find.

@dadibrokeit hello thank you for your response.

I appreciate the suggestions, i already did all of those (the rebooting, updating, etc.,) the past few months ago and i even brought my unit to the technician and they told me that my phone was just okay. However few months after, the issue was still there, example i turned my data on for internet then scroll on social media, minutes after my phone will get lag then it restarts automatically.

@intelljojv61786 This is a tough one. If it's not a software problem, which should be fixed with a factory reset, then you're probably looking at a board-level failure somewhere on the motherboard, possibly having to do with the NAND memory storage device. Alisha, (@flannelist), do you have any suggestions or thoughts on the subject?

i suspect that also, because i bought these phone 2nd hand with replaced battery (100% then year after 95%) so for sure this phone was opened.

should i replace the motherboard?

@intelljojv61786 Since Apple refuses to share any internal information on their phones, we're going on guesswork and experience when figuring out what these panic logs mean. The one you're seeing appears on MacBooks a lot more than it does on iPhones, but again, I've yet to see a definitive diagnosis of what's causing the problem. I would say there's a high probability that replacing the motherboard will get rid of the issue, but since we don't know the cause, I can't say for sure. If it was my phone, yes, that would probably be my next step, but of course it's up to you.