You have this warning from your logs below.
Thu Jan 1 08:01:44 1970 local0.notice : Detect fan[0].speed:0
Thu Jan 1 08:01:44 1970 local0.notice : Detect fan[1].speed:0
Thu Jan 1 08:01:44 1970 local0.warn : fan[0]:detected max fan speed:0 < max speed in fan spec:6000, please check params or repair the fan
Thu Jan 1 08:01:44 1970 local0.notice : fan[0].max_speed_detected:0
Thu Jan 1 08:01:44 1970 local0.warn : fan[1]:detected max fan speed:0 < max speed in fan spec:6000, please check params or repair the fan
The fan speed shows "0" so if the fan speed is not detected it won't start to mine.
Are these all 15 miners have the same logs?
I don't know if it can fix the issue by updating the firmware but you should do it first. However, if it does not solve your issue, then both fans might be faulty even the fan is spinning.
Can you follow the troubleshooting guide from this link below under "Miner can not search IP address (when using Whatsminer Tool)"
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https://drive.google.com/file/d/1EzaTC7wIgcw2ardcMYXznyzMuWniNxsG/viewAlso, follow the guide under "Miner Restart due to Abnormal status" from that link.