Also have a truck stop here. Had the opposite problem. Ball would not eject into the shooter lane. First I changed the outhole switch as i noticed a second press of the switch would make it eject. No difference but since a second press made it work, I theorized the vibration of the solenoid to move the ball into the optos was enough to make a bad connection complete. Resoldered all solder joints on both opto bards and cleaned with alcohol both emitters and receivers on both boards. No failures since.