FYI: Disabling IPV6 on the Quad Sata Hat will disable your Fans

[michael]

Trying to to run my pihole without IPV6 resulted in same issue.
I followed this advice of pompopom

Pi 4 Quad Sata Hat Fan always at 100%

There’s a workaround in starting the PIGPGIO service in IPV4 only mode. That way you can disable IPV6 at system level. /lib/systemd/system/pigpiod.service ExecStart=/usr/bin/pigpiod -l -m -n 127.0.0.1 -p 8888 The -m option is not mandatory but for disabling the monitoring for the service, decreasing CPU usage by 7%

and fans are running fine without IPV6.