At the begining everything is fine and quiet. After some time of non-stresfull work the fan starts to be very loud. Suspending stops the cooler, but it's laud again after a resume. The tempereture is around 40 C. I've tried to manually limit the fan frequency in my BIOS, but even when the frequency dropped from 2000Hz to around 1000Hz the noise didn't change. There are no wires or any other things that could have caused it. May it be some kind of malfunction?