onRollover hangs

Hello,
I’ve made a menu with 6 buttons. 2 Buttons have a drop-down function.
The problem is that when i move (to fast) my mouse over the buttons flash dont detect the on mouse out action and the button(mc) stays in the over state.

In frame 2 the code in an invisible button is:

on (rollOut) {
gotoAndStop(1);
}

In frame 1 is the code:

stop();

So the buttons keep sticking in the active state. Ho can i work around this?

Thanks for the help.

Traveller5