I have an electric fan that looks like this: Recently, when I flip the switch, the fan blades won't start spinning without any initial assistance. I have to manually push the blades to get them going. But this is not due to too much friction, the friction is the same. When I flip the switch, the motor starts humming, and the blades don't turn. I leave it like that and wait. When I return, the blades are still not moving, but the motor housing is freakin' hot. If the blades were given some assistance and carried on spinning, the housing would not heat up. Why does it heat up? What's the cause?