I was working in a place that used to be a food store. Talked to the former owner, they had a big problem with all the freezers turning off during the nights and when they came to work all food was unfrozen and had to be thrown away. Turns out the timer to the sign outside was connected wrong and also turned off the freezers in the night. I do understand them, the electricity wiring in that building was not fun to work with... The place had been several different stores, all adding to the cables and connections over the years.