Whatsminer M21S Fan Speed Increase Issue

Hey everyone, has anyone dealt with the fan speeds on the Whatsminer M21S? I've been running mine in low power mode for about 9 months without any problems, and the auto fan speed was stable around 4500 RPM. But recently, it's been stuck at 6200 RPM for the last month. The environment's the same, no change in temps (like 55, 59, 64C). I checked for any blockages and even restarted it. After the usual startup, the fans just jump to 6200 RPM and stay there. Any thoughts on what’s going on?

Did you manage to figure this out? Normally, M21S fans can hit around 7000 RPM, so 6200 isn't crazy high. Maybe your power supply's voltage or current fluctuated, which could've made the fans speed up. If you want to keep it at 4500 RPM, consider swapping to a lower-performance fan or adding a voltage regulator. Just my two cents.