My Flash Gordon rarely experiences some weird behavior when the ball drains. It will start counting the bonus, freeze for a second and then finish counting the bonus. It then lights for an extra ball and does not advance the ball count (in other words, it awards a free ball). At the same time the "Match", "Same Player Shoots Again", "Match" and "High Score to Date" lights all stay lit in the back box. They stay lit until the game is over. There doesn't seem to be any rhyme or reason as to when this happens. Sometimes no drop targets are down, sometimes some are. It doesn't appear to be a switch matrix issue to me. It only happens maybe once in 25 games. Any ideas? Thanks in advance for your help.