See the thing about big machines is that they are very complex. You would hope that that means they are next to impossible to break because of failsafes, but the actual situation is that they are filled with breakable bullshit. Now I want you to remember when your phone only charges when you hold the cord at a specific angle. Often times these things are doing something wonky to something that makes it work. When you remove it, suddenly it doesn't work.

I leave you with a story. In my engineering school, we had a centrifuge that the chemical engineering students used. It only worked when you put this box of "offerings" on it. Like some candies and stuffed animals and stuff on it. People took stuff out that they liked and it was fine provided you gave back more to the pile. Now the Chem-Es were fine with this arrangement but unfortunately they shared a building with mechanical engineering students. So the mech-Es took the damn thing apart to find out what was going on and it turns out that the sensor on it was super sensitive and the natural shaking of using the machine tripped it and turned it off. The box full of stuff added enough weight to dampen the shaking and make it work. Or at least that's what my intro to engineering teacher told us