I have the exact same problem. The game worked fine for months, absolutely 100% proper. Then one day I turned the game on and started a game. I soon realized as I was playing, none of the pop bumpers were working. Everything else worked fine. I thought I smelled a little something funny, like maybe something burned but not sure. I can go play a perfect game right now, it just won't have working pop bumpers. I will look into A1J6 next time I'm downstairs and can get away from playing MGOW!