Whatsminer M21 Errors,Power Detect

[hrjeff]

Hi
I bought 20 miners at 6 months ago but at this time 7 miner got this list of errors.
every months a miner get this problem, when i change this part everything be OK.
https://sc04.alicdn.com/kf/H899e94016e1c4f9fb89bb3923b90fd1dX.jpg
but why happen this problem ?

Error Code   Cause
      
201
   Power detect error, can not find power in config
   
410
   Slot0 detect eeprom error
   
411
   Slot1 detect eeprom error
   
412
   Slot2 detect eeprom error
   

[mikeywith]

What is the AC voltage at the wall? are you sure you have the M21 and not the M21s?

[NotFuzzyWarm]

Along with Mikey's question about power I have to ask about that bridge board: Do you actually replace it? It probably just needs to be re-seated. Every couple months one of my M10's does the same thing (1 board loses communications to the controller). I just open the miner up and re-seat that bridge board and all is well again for a few months.