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MacBook Pro Randomly Rebooting

I have recently upgraded my MacBook Pro (Retina, 13-inch, Mid 2014) to High Sierra (10.13.1). After the upgrade, I have experienced random reboots where the screen turns black for a few seconds, then the system reboots. These seem to happen completely randomly, sometimes after only 30 minutes of uptime, and sometimes after many hours of uptime.

The reboots do not trigger the usual kernel panic message nor the "Your computer restarted because of a problem" message, and there is absolutely nothing in system.log that points to a possible root cause. Here is a list of the things I have tried:

• Wiping the disk and reinstalling macOS, restoring a Time Machine backup
• Wiping the disk and reinstalling without restoring a Time Machine backup
• Resetting the SMC
• Resetting the NVRAM
• Using my Mac with minimal software installed (i.e. no kernel extensions)
• Hardware diagnostics (no problems found)

Any pointers to things I could possibly do to fix the problem?

Possible Fixes for High Sierra

You should try each, one at a time, then test to see if the problem is fixed before going on to the next.

    Be sure to backup your files before proceeding if possible.

1. Shutdown the computer, wait 30 seconds, restart the computer.
   
2. Resetting your Mac’s PRAM and NVRAM
3. Reset the System Management Controller (SMC)
4. Start the computer in Safe Mode, then restart normally. This is slower than a standard startup.
5. Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented (usually, Macintosh HD) volume entry from the side list.  Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and return to the Utility Menu. Restart the computer from the Apple Menu.
6. Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button under Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
7. Download and Install 10.13.1 High Sierra Update
8. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
9. Erase and Install OS X Restart the computer. Immediately after the chime hold down the Command and R keys until the Apple logo appears. When the Utility Menu appears:

1. Select Disk Utility from the Utility Menu and click on Continue button.
2. When Disk Utility loads select the drive (out-dented entry) from the Device list.
3. Click on the Erase icon in Disk Utility's toolbar. A panel will drop down.
4. Set the Format type to Mac OS Extended (Journaled.)
5. Click on the Apply button, then wait for the Done button to activate and click on it.
6. Quit Disk Utility and return to the Utility Menu.
7. Select Install OS X and click on the Continue button.

I have already performed all of the above actions.

Defective memory? Make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple.