So if I follow, after completing T-O-W-N, and you lock the ball behind the spinner, then another in the Gun Fight kickout, after plunging the 3rd ball and hitting the first switch, all but the ball locked behind the spinner eject?

Does that kickout hole operate normally otherwise?

Well, it doesn't sound like it could be a hardware malfunction. Have you changed any settings recently or replaced the battery? When I first got my game, and changed a couple settings around, when I'd play the game, there were a bunch of strange things that would happen: Replays would be awarded at random, the knocker would sound several times in succession, and other odd issues.

Try resetting all the settings/audits/adjustments to factory defaults. I believe that there is a single setting that does it for you. When I did that to mine, it cleared up all those ghosts in the machine.