External SWF dissapears afte sometime

Question

Hi There!
I have a preloader to preload a SWf file, everything works fine, except, when I run html file on any browser, external swf file dissapears after 1-2 minutes,
basically, I put preloader (swf file), on html code, and preload the external swf.
this is the code:
import flash.geom.*
import flash.display.*
var loadurl:String = "external.swf";
var nDepth:Number = 0;
var nWidth:Number = 200;
var nHeight:Number = 20;
var cLoader:MovieClipLoader = new MovieClipLoader();
var oListener:Object = {onLoadInit:onContentLoaded};
var mcLoader:MovieClip = this.createEmptyMovieClip("Loader_MC", 0);
var mcContent:MovieClip = this.createEmptyMovieClip("Content_MC", 1);
var cMatrix:Matrix = new Matrix();
cLoader.addListener(oListener);
txtPercLoad = mcLoader.createTextField("PercLoad_TXT", nDepth++, 0, 0, nWidth, nHeight);
mcContent._alpha = 0;
mcContent._lockroot = true;
mcLoader._x = Stage.width/2 - mcLoader._width/2;
mcLoader._y = Stage.height/2 - mcLoader._height/2;
txtPercLoad._x = mcLoader._width/2 - txtPercLoad._width/2;
txtPercLoad._y = mcLoader._height/2 - txtPercLoad._height/2;
cLoader.loadClip(loadurl, mcContent);
_root.onEnterFrame = function()
   var nBytesLoaded:Number = mcContent.getBytesLoaded();
   var nBytesTotal:Number = mcContent.getBytesTotal();
   var nPercLoaded:Number = Math.round(nBytesLoaded / nBytesTotal * 100);
   if(nPercLoaded > 0)
      SetTextFormat(txtPercLoad, nPercLoaded.toString() + "%");
function onContentLoaded(Void):Void
   SetTextFormat(txtPercLoad, "100%");
   cLoader.removeListener(oListener);
   delete _root.onEnterFrame;
   delete oListener;
   delete cLoader;
   _root.onEnterFrame = function()
      //trace(_root + "::onContentLoaded::_root.onEnterFrame");
      var nInc:Number = 5;
      mcLoader._alpha -= nInc;
      mcContent._alpha += nInc;
      if(mcLoader._alpha <= 100) {mcLoader.removeMovieClip();};
function SetTextFormat(txtField:TextField, sText:String)
   var txtFmt:TextFormat = new TextFormat();
   sText = "Loading Content " + sText;
   txtFmt.font = "Arial";
   txtFmt.align = "center";
   txtFmt.size = 12;
   txtFmt.color = 0xff0000;
   //txtFmt.bold = true;
   txtField.selectable = false;
   txtField.text = sText;
   txtField.setTextFormat(txtFmt);
   txtFmt = null;
Please let me know what I am doing wrong? thanks in advance

Answer 1

If you keep an eye on the value of mcContent._alpha, you'll see that because you never shut off that second onEnterFrame function, the _alpha property continues to go up until it reaches a maximum and then flips negative, which means it goes invisible.  I confirmed this with running your code.
I don't know what the limit is.  In Actionscript, when a number limit is reached it is common for it to advance to its opposite limit - basically a looped numeric system.