After running 15 minutes to fishing spot, after about 2 hours of sitting, starter would not engage flywheel, leaving us stranded. It has happened 3 times, but previously, it would work normal after a few minutes. When I manually moved the starter gear the flywheel and turn the key, the solenoid makes all kinds of knocking noises. I've never done anything to the starter in the 4 years I've owned the boat. Help Please...