Thanks Craig. We’ve been investigating all day. Nothing on the prop and it looks good and clean. No black smoke or any other symptoms coming from the engine. The prop spins while we are looking at it but after a few hours of motoring, does not seem to be able to handle going into any wind or waves. Wondering if it may be a gearbox oil issue? That maybe it shuts down as it heats up? Baffled at the moment. Thanks for the response! Lisa