Game and Bullet problems

Hello. I am having a problem with the collision detection with the bullet engine. When I move the cube, dynamic rigidbody, the physics usually stops working after a while. I really dont know why. So any help would be greatly appreciated.

Here is the .blend: http://www.savefile.com/files.php?fid=8543968

Also, I’m at a loss with some python. I would like my armature to rotate inversely to the cube when the cube is at a positive angle. For example, going up hills; the armature and character would be straight up.

Bullet physics disable automatically after a while. You can disable this by selecting No Sleeping on the newest test builds of 2.42.

Ah, thank you very much.

On a side note, I am really at a loss on how to have “global” variables, or how I can access the rotation of different objects.