A problem with a timer event sometimes not working

Question

Guys...
I have this problem:
I have a child added to the stage eacg 5 seconds and if this child still on the stage after another 5 seconds, you go to the next frame...
My problem is that sometimes it does not work, meaning that you can have this child on the stage for ever and nothing will happen... but sometimes it does work properlly...
Is there any mistakes in my code or what should I do?
var miC4:Loader = new Loader();
miC4.load(new URLRequest("nivel1.jpg"));
addChild(background1);
background1.addChild(miC4);
if (!lives){var lives:int = 3;}
var enem1:Loader = new Loader();
enem1.load(new URLRequest("1enemigo.png"));
var enemy1Array:Array = new Array(enem1);
var t1:Timer=new Timer(5000,1);
var t2:Timer=new Timer(10500,1);
recycleEnemy();
function removeEnemy(){
           background1.removeChild(enem1);
           recycleEnemy();
function touchListener(event:MouseEvent){
    enem1.removeEventListener(MouseEvent.CLICK, touchListener);
    removeEnemy();
function recycleEnemy():void{
        enem1.x=(50 + Math.random() * (stage.stageWidth - 150));
        enem1.y=(50 + Math.random() * (stage.stageHeight + -100));
        t1.addEventListener(TimerEvent.TIMER, addEnemy);
        t1.start();
        t2.addEventListener(TimerEvent.TIMER, bang1);
        t2.start();
function addEnemy(e:TimerEvent):void {
        background1.addChild(enem1);
        enem1.addEventListener(MouseEvent.CLICK, touchListener);
        enemy1Array.push(enem1);
function bang1(e:TimerEvent):void {
    if(enem1.stage){
                lives--;
                if (lives >= 0) {
                    t1.stop();
                    t2.stop();
                    removeChild(background1);
                    gotoAndStop(5);
Thanks a lot!!!!

Answer 1

ok, so there are a number of issues.
the first error is enemy1Array contains two duplicate objects ~5 seconds after entering that frame.  i'm not sure if that's a problem because i don't see where you're even using enemy1Array, but you should fix that error (if enemy1Array is used) or remove enemy1Array (if it's not used).
the next problem is you can call recycleEnemy more than once and re-add those timers.  flash will probably protect yourself from the bad coding but you shouldn't count on it.  when you call removeEnemy you should stop those timers and remove those listeners before re-adding another pair of listeners.  or just reset the timers in removeEnemy and start them in recycleEnemy.  there's no need to re-add those listeners more than once.  they could be added in your if(!lives) conditional.
the next (and probably most important) error is your removeChild(background1) statement which fails to remove enem1. so, when you re-enter that frame you have an enem1 on-stage that you can't kill and can't even reference.  remove it when you remove the background1.