I have an acer nitro 5 with two controllable fans, one for the cpu and one for the gpu. One of my fans slowed and then stopped spinning entirely. I then opened my laptop and took apart the fans. it seems that my fan had some sort of resistance so it couldn't spin. i took it apart and cleaned them. And when i put them back there was no more resistance. But its been a few days and the problem has returned. It slowed and now it doesn't work at all. What is causing not to spin?