I noticed a strange issue with my Special Force (6803) machine. I have it set to for 5 balls per game. For some reason the game will not retain earned extra balls. For example, if I have "extra Ball" lit, shoot the weapons ramp to collect it, it says on the display "EXTRA BALL", lights flash etc, but the "shoot again" light does not light up, and when the ball drains and the round is over, the extra Ball is not awarded. If I were to earn an extra Ball while on Ball 5, when the ball drains the game is over. Very frustrating. Fyi I have an Escape From the Lost World machine too (also a Bally 6803) and this does not happen.
Has anyone experienced this? Any advice to fix it? Possible game adjustment issue I'm missing here?