Quoted from CUJO:
Had the same thing happen to me on one of my first three games with my CCRLe. It's only happened twice in like 100 games.
I have occassional issues with the center clear ramp. If I enter that ramp at a high rate of speed sometime the ball hits the edge of the ramp cover plastic and comes back down.
I believe the two times the ball dropped into the cabinet, I launched the ball up and over the back playfield vertical graphics wall on the right side.
There is just enough gap for a ball to make it over that.
Then its not something that happens very rarely, as your average so far is 1 ball in the cabinet every 50 games - I think my game has less than three dozen games on it so far. I’m going to add a piece of wood, maybe 3/4” x 3/4” - won't know until I measure. I don’t think it needs to go all the way across, because there’s much less chance of a ball going over the top on the left side above the pop bumpers. I haven’t noticed the issue like you’re having with the center ramp, but will keep an eye out for it and see if it happens. You might want to add a couple of washers under the plastic ramp cover to the two bolts to raise it slightly. It might be the case that the flippers are too strong. I’m going to try turning the power down on mine - the pitch seems good, the game plays fast, and the ball makes it up all ramp shots easily. I want to try and reduce air balls, and the potential to break plastics.