I've got a strange problem with my Cow Poke: about one ine twenty times when the ball drains, there is a loud buzzing and either the units or tens reel rotates. I have discovered that when this happens, if I open the coin door and then close it with a reasonable force, this behaviour stops and I can continue. Close the door to hard and the machine tilts, and not hard enough and nothing happens.

What could the problem be that closing the coin door with reasonable force fixes it? Thanks for any suggestions...

My original post is not quite correct - the reels don't actually rotate, they just move but never actually click over. The buzzing seems to be coming from the backbox, and while this is happening, the roto target rotates, stops, rotates again and so on. And the score motor is constantly running.

Closing the door with a bump seems to make all the lights flicker off just for a moment, and that momentary loss of power is what seems like is releasing whatever is stuck and the game can continue as normal.

I can't play the next ball because as this is happening, the ball is not released from the drain to the ball feed machanism. So the ball release sequence isnt happening until I bang the door.