I have had that problem too, and thought about posting it here. Glad you did. I think it has something to do with the rollover in the shooter lane. I notice if I hit the ball into Woodbury and if it goes WAY up and then comes back down, I always get the Extra Ball. But if it goes in there and does go over the rollover kind of quickly, I don't get it 1 out of every 3 times I hit it. I'm not sure how the code is written for when it is lit up during multi-ball, but I have been awarded the Extra Ball MOST of the time. I live with it, but someday when I have time, I'm thinking about pulling up the rollover wire a bit and see if that helps. If not, I might just change out the switch. I think the problem is in that area and nothing to do with code.