United puck bowler not counting frames or changing players. Machine starts, score reels reset, Player count adds correct number of players, frame count shows 1. Slide the puck, 1st player scores show correctly. Game does not go to player two after player one has completed it's frame. Can manually move to player two, but when player two frame is completed, machine stays at player two frame one. Would this be a problem relatrd to the frame control unit, and where should I begin? Thanks