Take a look at this linux interview question

I have this server which seems to drop off the local net every so often, and comes back on its own. How would you debug this ?

Too late to be any help whatsoever but probable answer was check the night time cleaning crew are not unplugging something to use vacuum cleaner or whatever. Probably related to the story of patients dying in a certain hospital room as cleaner unplugged life support to use floor polisher. (not actually possible as plugs are different)

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