Switches....?
It seems like you got a switch bad. I'd first check continuity on the stop button, since it's designed to ground the coils and kill the spark to the plugs. If you have another, then you can either just change it out or jump the one you have by disconnecting the wires.
The stop button and the tether cord work together. The Stop button switch is normally closed and the tether is normally open. You can jump either or both of these switches to see which is bad. Sounds like the Stop Button switch button is sticking to me. :cheers: