Physics problem object falling off

I need to run a ball inside the donutt but it keeps falling out at certain point. Tried applying scale/rotate, same results.

Ok i solved the falling object problem by setting linear velocity instead of location coordenate. But now the object stop moving when reaches certain coordenates and i don´t know how to solve it. What i need is the object to loop inside the torus, aways moving forward.

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Make sure you are moving in local location in the motion actuator (click on the square with ‘L’ inside of it ) What about enabling collision bounds or setting physics type to rigged body ??