I remember having this happen a lot when I first assembled my machine. Once I increased the height of the rear leg levelers it now happens much less frequently and I don't break into a panic sweat when the ball travels into those bumpers anymore. I'm getting more annoyed at the absence of the post on the far left outlane, my ball drains into there like mad. Thinking of inserting the post there but I don't want to feel like I'm cheating to win.