I was working all day (13 hours) mainly using notepad, and left the computer a few moments to get something to eat.
When I came back, the PC had entered sleep mode, and when hitting a key the PC blue screened with the message "Restarting...", and then it used an hour or two for installing updates. ("Don't turn the computer off")
Now, I have thoroughly searched Documents and C:\Users\[username]\AppData\ including subfolders, but no relevant temporary files was found.
Please don't tell me to change "update settings". I have done this a billion times, and every time it goes back to notification off and 8:00 - 17:00.
(Exactly this scenario has happened many times before)