I have some boxes glued to one “handle”.

After falling this “handle” have strange “dancing” movement.

I need to have this structure because the number of boxes should be procedural.

What is wrong in my test scene?

Thank you!

I've done some tweaking in your scene and it seems to work properly.
Here is the file
http://rapidshare.com/files/66277757/cubes2.hipnc [rapidshare.com]