5 CK-Box miners

What is the HW error?
Miner #1 came from the Goldshell July batch.
Miners #2 through #5 came from Goldshell August batch.
All miners have been upgraded to the latest firmware.
Miner #1 has more HW error, higher fan speed.
Althought miner #5 has high HW error in comparison to the other 3 miners.
Do I need to restart the miners seldomly? weekly?
Here are the 9 day, 16 hour stats of my 5 CK-Box miners.

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