Hmm, there are two things that could possibly cause your computer to turn off by itself. Wake on LAN which is unlikely or the power plug that you are connected to is varying voltage and causing the computer to act as if it got shutdown during a power outage and turning itself back on.
To check for both of these things, load into your BIOS and see if you can turn them off. If that isn't the case then check to see if your Bios doesn't have an auto-start function that is based off of the system clock your BIOS retains.
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