I agree with @tscottn, it’s probably the AX relay adjustment. I had an issue with our king pin where it would randomly reset the score during the game. The ax style in king pin is the older latching relay with the metal tabs. You still need the really solid latch/unlatch clicks. In my case I had to clean the knife edges of the metal tabs and do a slight adjustment of the movable coil to get smooth operation. I’ll try to dig up the page that gave me that clue.
Good luck, you’ll get it.
Dave