Yes thats the first one to break, my bike was about two weeks old when I heard a rattling noise. Fearing a reweld breaking over and over, I made a simple bracket that bolts to the frame under the radiator mounts. Even that cracks every two years, but is super simple to make from sheet metal.
My guess is your broken frame mount is making noise. Fix it good either by welding or a bracket, then recheck for noise.
Keep us posted on your progress. John