I have a similar problem with my Xenon, mine will also sometimes when the ball drains, kick out both balls into the shooter lane, I'm running the Alltek MPU and have wondered if that is the issue, but cant seem to find anything else wrong. (sorry not trying to hijack your post just thought I would let you know of another Xenon that is doing the same/similar thing.) I have just put up with it as it still plays well.