I have a 15 year old 4 burner Viking stove with the convection option. The stove igniters quit working years ago and now I am trying to fix them. I replaced the electronic control box, but that didn’t work. I replaced the 4 igniters and didn’t work. I have cleaned the burners with a wire brush and that did not work. The ignitors won’t stop sparking. But, here is the weird thing. If I turn on all 4 burners they stop sparking. If I turn on the left rear and the front right they all stop. If I turn on the right rear and the left front they all stop sparking. Any other combination and the ignitors all keep sparking. Help! 