My PWM fan regularly stops spinning – is it defective?
No, the fan is not defective. Thanks to the new motor technology, our new PWM fans come with the so-called 0 dB mode. If the PWM signal falls below 5%, the fan stops and is therefore completely silent.https://www.arctic.ac/en/My-PWM-fan-regularly-stops-spinning-is-it-defective
If the operating load of the computer increases again and more cooling is necessary, the fan is informed via PWM and starts again. This happens fully automatically.