Laptop fan weird noise?

Fl
2

The CPU fan of my laptop "rattles" briefly when it starts to turn or when it stops again.

While it is turning and the speed does not change, this slight "rattling" does not come either. Only when changing the speed.

What could that be?

For links to the sound, please refer to the last question.

Bo

When was the last time you cleaned the fan?

Fl

Yesterday.

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