Collision issue

The other day I posted a question about Unity Collision inmy game but didnt provide enough detail. Here it is again with proper detail and video included.

It is a puzzle game using gravity and rotation the board as seen in the video. Each cube is a child of the blue backboard so they all rotate with it. They have rigidbodies and have tried both mesh and box colliders but get the same issue with both.

The sphere uses gravity and has a sphere collider. The problem is it collides with the cubes sometimes consistently but will then just fall through and with enough momentum fall completely through the whole level. Here is the video (taken on my phone)

http://www.youtube.com/watch?v=h5fO2YXthg4&feature=youtu.be

Here is the javascript for rotation

 var speed : float;

function Update ()

{

transform.rotation.eulerAngles += Vector3.right Input.GetAxis("Horizontal") speed;

}