Double check your events, you may be making the object jump while shaking the camera, because the two have nothing to do with each-other.
If everything is fine and you can reproduce it in a very simple sample file, you may need to make a topic in the bug reports identifying the problem.
So, again, while you make the action to shake your screen, check if in any circunstancie it's possible to trigger a jump or moving anything more than the camera.