Gang, bought a boat with a 1997 Johnson Fict on it....Take it off the trailer, run about 100 yards with her and the warning siren goes off (solid) and motor goes into safe mode. Cut the key off and start it back up and she runs like a sewing machine for an hour or so and then it will do it again. Might do it again two hours later or two minutes later....Can't find any consistent condition that creates it. Any thoughts? Sorry I don't have the model or seriel number with me...