Why can't I click on the movie clips when they are moving fast?

Question

I am making a game where insects in an array fall down from above the screen. The user clicks on these insects to increase his/her score. When the score reaches specific points, the speed increases. When the speed increases, it gets harder to click on these movieclip insects. There is one particular insect where you can't click on and destroy at all when the speed becomes fast. This is the code inside this particular insect. Note that all insects have the same codes in them, but this insect in particular is very hard to click. This insect also has animation in it; I tried making a transparent box around to make the click easier, but it's still not working right.
import flash.events.MouseEvent;
    import flash.display.MovieClip;
    import fl.motion.Animator;
    import flash.events.*;
    var MainTimeLine = MovieClip(root);
    this.addEventListener(MouseEvent.CLICK, kill3);
    this.dead = false;
    function kill3(e:MouseEvent):void
        this.dead=true;
        mouseChildren=false
        gotoAndPlay(31);
        this.removeEventListener(MouseEvent.CLICK, kill3);
        flash.utils.setTimeout(removeSelf2,2000);
    function removeSelf2():void
        this.parent.removeChild(this);

Answer 1

there's nothing about a movieclip's speed that would stop it from being clickable.
your transparent box, should have its visibility property true and alpha=0.