Quoted from Grayont:I’m aware of this feature, thanks for the clarification. But what me and s000m are talking about is a non intended rattling that occurs just above the upper flipper when shooting the left orbit. The ball hits something and rattles/bounces around and loses all its momentum and falls back, not making the orbit shot at all. The post comes up intentionally on a successful orbit shot where you get credit for hitting the switch. What we’re talking about is just lots of rejects at the entrance to the orbit, just above the upper flipper, near where the balls exit for ninja pizza multiball. It’s probably just part of the game and hitting it too hard makes it rattle.
My bet is that the ball guide there isn't quite a smooth curve, I had it on both orbits of my AIQ. Basically there is small "kink" in the ball guide rather than a smooth guide. So when the ball hits, right in that spot, rather than hugging the curve, it bounces, rattles, and/or hops. For me, the fix was as simple as loosening a few of the through hole bolts of the ball guide and the wood screws and retightening with a more natural curve to it.
I'm not saying this is your issue but it certainly could be.