I second the recommendation to make sure you're using induction ready cookware. If you are, try flipping the breaker for the cooktop off for a few minutes and then turning it back on to reset the electronics. The breaker for ours is in the midship half bath.
Also, are you on 50 amp shore power? If only on 30 amp, if you're running AC or other high drawing things, it may not be getting all the power it needs.