Noisy Down spout

I have a problem with my downspout. When it is windy (around 40 mph wind), it make a lot of noise. It feels like the downspout wants to separate from the house. I touched it when it was making noise and it was vibrating. It was hard to determine if there was air inside he pipe.

I called a professional gutter and downspout person. He said that the downspout was properly secured to the house. His solution was to move it to the other side of the house. He never came back to do this.

I think that the downspout is not flat against the house. I see a few places where you can see daylight. Is it possible that air is being forced through these spaces? Or is the air going into the downspout pipe from the Gutter and causing it to downspout vibrate.