I had a problem with my Whirlwind after rebuilding flippers that was similar and is easy to check. Even if the leaf switches are brand new, you need to take a dollar bill and run it through the contacts on the leaf switches in the flipper buttons and in the flipper mechanisms themselves. When they ship them, they include a very thin chemical coating to stop rust. I give it a 50% chance this fixes your issue, and if not it is something you can try for free with little/no risk to your machine. Good luck!