Obviously, this is boards problem.
They are sometime overheated and now we have some chips with poor contact.
My recommendation. Turn the controller to the other side, so that data cables can be exchanged. It is only four screws, at Controller metal frame.
Check , the error is repeated on the same blades or not.
Come on, i would know if the problem it's the controller board im talking that 22 miners from different batch do the same thing! and people here come and say to check the PSUs.. it's like they are not reading what i typed..
What are the odds that me and my friends have bought 22 miners with the left BOARD with problems???