Hey,
My apology I should have read the game specs :)
as usual Nino is probably on the money Re the vibration and switches.
couple of questions though,
1) which one is this left or right?
2) does the function work properly on the other drop/captive ball?
3) did you try putting the paper/cardboard in the captive ball target switch?
4) oh and did your game reset to defaults recently?