I built a new PC from the ground up a few year back. Every morning when I would sit down to start working I noticed it had rebooted around 6:30 am. I searched through every single log, ran all sorts of hardware scans, checked power outputs, dug through everything in Task Schedulers, and could not find a single reason it would keep rebooting. There were no Event Logs showing the reboot was initiated and no minidump files so it wasn't a BSOD.

I woke up early one morning and sat in my office waiting for it to reboot and nothing. The next morning I go in my office at 8 and it had rebooted. Some mornings it would reboot and others it would not. I was convinced it had to be my power supply and was about to order a new one.

Then I came downstairs right at 6:30 one morning and caught my son walking out of my office. Turns out he was going into the office every morning and holding down the power button and forcing a reboot because liked watching all the RGB light turning all at once when it would turn on.