Next time you shut down your FX-3, or other G3X Carbon Cub, would you please try the following test:

Ensure Master, IBBS, and emergency ignition are all off but all breakers are In.
Lift the stall warning vane on the left wing - Does the stall warning sound?
If stall warning sounds then pull IBBS breaker.
Lift stall warning vane - does stall warning sound?

Please report results here.

Thanks.