cyclonefanatic

I have a '02 Cyclone with 540 hours. A couple times we have had the audible warning alarm go off and the boat will idle very rough. The temp is fine and the oil pressure is fine via the gauges. If we shut off the boat then turn it back on it runs fine. It may do it once in a weekend or 3 times in an afternoon, or none at all. It's so intermittent I can't recreate the issue for the mechanic. Has anyone else had this issue? The boat was checked for codes and none were present.