ActionScript 3.0 :: Tween Function Stopping In Middle Randomly

I have a game where the player movement is dynamic but have the same template, so the movement is performed by a Tween() with changing variables. next I create a listener for the "TweenEvent.MOTION_FINISH" event of that tween, the purpose for that listener is because when the movement animation ends I call a function to show the player his next movement options.

here's the thing: in some cases, randomly, when the player performs a move the tween just stops suddenly, this is problematic for two reasons: first the player character stops in the middle of a movement, secondly the "TweenEvent.MOTION_FINISH" event is not thrown and the function that show the player his next movement options is not called.