The premium/le has this cross bow thing that seems to trap the ball on the apron and you have to shake the hell out of the game and go through ball searches. Its a real deal breaker for me. Also I find a lot of air balls especially flying off the ramps that also ruined game play for me. This occurred more times than not.
That crossbow mech was defective from the beginning. Had a mate in the US with a similar problem so you are not alone in that observation.
In the end he had to disassemble it from the machine and send the entire crossbow mech back to Stern for a replacement.