The last few times I have played my Metallica Premium, every few games, during one of the balls, for no known reason, the flippers will die and the game goes into end of ball mode, adding up the bonus scoring, etc., but the ball has not yet drained. Once this happens, the ball drains as all the switches, bumpers, etc. are inactivated. I am not sure why the game is sensing like I drained the ball when I haven't. I assume there is some switch that is triggering this but don't have a clue what it could be and it is so random, it has been impossible to replicate. Any ideas what could be causing this issue?