At 10pm, a janitor came in, unplugged the computer, and plugged in his floor clearer, cleaned the floor, and then when done, unplugged the floor cleaner, and plugged the computer back in.
The consultant then suggested using the outlet on the other wall that had a free outlet (and got a 'difficult to unplug' cover for the outlet with the computer).
The next night he stayed late again and the janitor used the outlet on the other wall.
The consultant then told management that the problem had been solved and it was a buffer problem.
Apparently there are tons of these stories [2] [3], many of them probably urban legends.
But there was one last year that was definitely real [4], when a cleaner removed power to a freezer holding decades of samples, apparently because they were annoyed by an alarm sound it was making.
[1] https://www.goodreads.com/book/show/3227607-the-devouring-fu...
[2] https://old.reddit.com/r/talesfromtechsupport/comments/5yrs1...
[3] https://www.logikalsolutions.com/wordpress/information-techn...
[4] https://www.theguardian.com/us-news/2023/jun/27/cleaner-coll...
https://archive.org/details/devouringfungust00jenn/page/96/m... (pages 97 to 98) is the proper telling of the story.