Hi forum, does anyone have any experience with whatsminer M21s fan speeds? I've been running my miner in low power mode, for about 9 months without issue, auto fan speeds were stable at about 4500RPM. For the past month, the fan speeds have been stable at 6200RPM.
No change in the environment, ambient temperature, or board temperatures (~55, 59, 64c). I checked the fans, nothing blocking intake or exhaust fan and have restarted the unit. After its normal 5 minute startup cycle the fans slowly climb up to about 6200 RPM and stay there.

Any suggestions?