So i’ve been running a lot of S21+ 235Ts and I noticed a very annoying issue.

From time to time (usually around 9pm to 12am) they will start cycling fan speed from very low to very high over the course of about 30-45 seconds

This can last from a couple hours to 10 hours or until I decide to restart them… Either way they do finally go back to running steady RPM and humming like a kitten as they say.

Any ideas why this is happening?

The temperature is steady (21c), no real variables. It just stinks when they go from 3500 rpm all day, then all of the sudden start cycling fan speed up to 6000rpm then down and up and down and…

Btw, my S21 Pros do not have this issue at all.