Button MC gets caught

Once again seeking for help :slight_smile:

I created an animated button, so its behavoir is actually a MC and placed an invisible button over it with the AS. It works fine, but if one rolls over it slowly from top to bottom (or bottom to top) it gets caught and stays on the last frame of the animation :frowning: does somebody know how to avoid this, so when the mouse rolls out again the button will change back?

I included fla and swf…