x11ssl-f fan speed keeps crashing

hi everyone

i got supermicro x11ssl-f and decide look at ipmi and see fan speed at and notice it keeps slowing down and speeding up on all fans
i have tried this https://www.ixsystems.com/community...nge-ipmi-sensor-thresholds-using-ipmitool.35/
but still no change and tried different fan modes.
why trying fix problem notice hdd temp hot on cold days



i take any help
thanks Luke