OK, so cruising down the lake at about 4,000 rpm when I hear a bang and then as I throttled down hearing a sound like beating a pan with a metal rod. Once I determined that I could proceed at idle speed I made it back to berth. Halfway home the noise subsided and then quit. Never tried to load or reverse. Boat guy will get to it later. But just curious if anyone else had such an issue? Stock Bravo unit with 500+ HP.