manual or auto?
hint manual should stop issue.
try 60% or s0
and 60% is not that slow. about 4000rpm
I normally leave mine blank (100% and Auto). I did try setting the fans to 60%, 50%, 40% with no change-----No Hashing. I also tried hard/soft reboots with no change----No Hashing. I do have them separated from the group so that I can work with them.
https://i.imgur.com/nqtRlyq.png
Do you have static or dynamic ip addresses?
Looks like the Dns is working, all pools alive.
Are you running oct 23 firmware?---Latest Firmware
Do you have static or dynamic ip addresses?---Dynamic
Looks like the Dns is working, all pools alive.---Yup, all alive except No Hash
Did you try the router trick? Besides, if you have some bridge, like airport express, you need to replug it as well.
This worked for me in an identical situation.