Revolution mining.
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Hmmmm where is their location? I’d check the temps at that location, if they are going down it’s probably because they can’t ventilate quick enough to keep them projected. Or it doesn’t matter how much they ventilate because it’s too hot outside. After August when temps start to cool down you’ll probably be up 24/7. 
I’ve heard some places have agreements when the grid is under a lot of pressure, mining farms have to turn off their miners which is why they get cheaper rates. So if it’s real hot and everyone’s running their aircons, that will do it. It might be in his agreement that the farm guarantees 95% uptime or something for things like this. Might be worth checking
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