Thanks for replying.
I have only one frame in this sprite, and I use "Circle" collision mask. (it doesn't help changing this"
It behaves this way even with a new project, made as simple as can be.
Here's how to reconstruct my problem.
Create a new project with a layout size of 4320 x 7680
Create one sprite with size 80 x 80 px -> Give it the physics behavior.
Create a tiled background -> Give it the physics behavior, and set to "Immovable"
Add event: OnStartOfLayout -> SetWorldGravity to 80.
Add event: Sprite -> OnCollision (with TiledBackground) -> Play Sound.
Drop the sprite over tiled background and run project.
(To see the actual shaking, set the layout scale to 3, as I have it in my game)