So after measurement, at the plug that goes into the miner, I got exactly 244 volts. So the lack of power does not seem to be an issue.
But you are slightly above specs which is as bad as being under it, the specs on their website say " 210~240V", it's only a 4volt difference but might be worth looking into.
... which leads me to think there is a heat sensor issue. Could I be onto something?
Each hash board has its own sensor/s, the likelihood hood of all temp sensors dying together on the same miner is pretty low.
Doesn't Inno provide some sort of Kernel log? I suppose they do, please post the full logs here.
My initial guess is power-related issues, second, comes the network, but I am hoping to find some clues in the kernel log.