At least on my machine the left ramp seems to be an issue. I do not believe it has much to do with the crossbow. Rather, it is the way the ramp was design. The ball hits the bottom on the ramp and the ramp and ball both pop up. Stern must have known about this issue due to the fact that there is a plastic cover above the ramp. I also think owners will eventually get excessive wear on the playfield wear the bottom of the ramp and playfield meet.