Ender 3 Fan problem

I checked inside this fan , nothing there , clean ..

VIDEO

https://streamable.com/z32bpi

&

https://streamable.com/677uqu

Please help

Sometime it starts when it touches end switch and sometime when i start the printer

Make sure connection is secure on the mainboard and fan. After that try reflashing the firmware. It should be running non stop when the printer is on.

Thank You i try