If it keeps happening every time it's reloaded, then that is an issue. But from what I saw, when I replanted a crop, wandered away and came back, the crop was still visible. I assumed the same would work for fixing the machines.
The machine thing could also be a real problem when to comes to transformers, though, since stuff could actually explode if wired incorrectly.
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Ginhyun
http://i.imgur.com/15vH5.gif