AIR AS3 for Mobile - Download zip file crash the application - actionscript-3

Question

I've make an application with AIR and ActionScript 3 ( Using the IntelliJ IDE )
At start of the application, it loads some zip file and extracts their files to put them in the local storage. For futur use ( Or an utilisation if the user kills then re-opens the application )
It works correctly without problem the most of the time except that I have, sometimes, with a very low rate of appearence, a crash of the application during the download of those zip files.
The strange thing is these crash can occur directly in the emulator on my computer ( With a message that indicates an error in AIR ).
It is really difficult to check because these crashes may occur, something, like one time on forty launches and seems to never occur when trace() are with the debug mode.
That makes me think it's probably a problem with the speed of the loading, because all trace() slows down the launches and files loading.
Apparently, it's not a memory crash. I've tested and used the same code to load a really high number of same zip together and it doesn't crash.
I can't directly show the code, because it is implanted in a more complex framework.
The concerned code is something near to this :
private static function fileLoad( url:String ):void
{
var loader:URLLoader = new URLLoader();
var header:URLRequestHeader = new URLRequestHeader( "pragma" , "no-cache" );
loader.dataFormat = URLLoaderDataFormat.BINARY;
loader.addEventListener( Event.COMPLETE, complete );
var request:URLRequest = new URLRequest( url );
request.requestHeaders.push( header );
request.method = URLRequestMethod.GET;
loader.load( request );
}
private static function complete( event:Event ):void
{
var file:File;
file = File.applicationStorageDirectory.resolvePath( "ZIP.zip" );
var bytes:ByteArray = event.target.data as ByteArray;
var stream:FileStream = new FileStream();
stream.open( file , FileMode.WRITE );
stream.writeBytes( bytes );
stream.close();
var loadZip:Function = function( event:FZipEvent ):void
{
var zip:FZipFile = event.file;
if ( zip.sizeUncompressed != 0 )
{
var fileData:Object = {};
var file:File = outputFile.resolvePath( zip.filename );
var stream:FileStream = new FileStream();
file.preventBackup = true;
stream.open( file, FileMode.WRITE );
stream.writeBytes( zip.content );
stream.close();
}
};
var inputFile:File = File.applicationStorageDirectory.resolvePath( "ZIP.zip" );
var outputFile:File = File.applicationStorageDirectory.resolvePath( "folderZip" );
var zipFileBytes:ByteArray = event.target.data as ByteArray;
stream = new FileStream();
stream.open( inputFile , FileMode.READ );
stream.readBytes( zipFileBytes );
stream.close();
var zip:FZip = new FZip();
zip.addEventListener( FZipEvent.FILE_LOADED , loadZip );
zip.load( new URLRequest( inputFile.nativePath ) );
}
I don't really expect a total solution but, if you have encountered a similar problem, I'll be thankfull to know what you've done to resolve it.
Thanks a lot