The machines are now automatically starting and stopping!
These things know what time it is, and now they are programmed to start and stop themselves. Presently, the installation starts itself at around 7PM on Fridays. Since the power draw is substantial, they are programmed to start over an hour or so. If they all tried to start at once, it could overload the electrical circuit!
Some of them are reluctant to go along with the program. These old machines are all individuals and some of them are cranky and, well, obstreperous. I guess I just have to put up with them….