Similar scenario with a line printer
I once worked with a colleague who'd been repeatedly called out to solve issues with a line printer in the 80's.
Said printer was in a an office in a small industrial unit. Most Monday mornings, the platen on the printer would have a nice sheen of condensation, causing the paper to slip.
Despite repeatedly explaining that there was nothing they could do other than allow the condensation to disperse, he was there almost weekly.
Until he explained to the girl there that it was down to the stale electricity from the weekend and they needed to wait an hour or two for it to pass through and have enough energy to drive the printer.
No more calls.