Many moons ago during my aerobatics training in a Super Decathlon the fan used to stop regularly during prolonged spins. Right or wrong, my bum used to take an extra grab of the seat when the fan stopped even though we were at a very safe height in the aero training area. Old Ian the instructor used to say "Use yer finger. Use yer finger."
He meant on the starter button but I admit to never being entirely comfortable with no noise upfront in this aircraft with what always seemed a tired battery; and all this post CPL.