Twice today in two consecutive games I was playing, the flippers would just go dead with balls in the play field, not sure about the first time, but the second time I was definitely in multi ball.
Odd thing is that the inlane/outlane inserts would continue to move, before the balls would drain by pressing the buttons, but the flippers would not activate.
After the ball/balls would drain, everything would go back to normal.
I am thinking a trough opto may have issues, but I have not ran through a switch test yet,
Any thoughts?