Problem with external swf dissapearing after so long

1

i have a movie using this preloader which i got here from another post that uses this code on the preloader movie itself.

onClipEvent(enterFrame){
if(dummy ==1){
_root.text._alpha += 10;
}
loaded = _root.clip.getBytesLoaded();

total = _root.clip.getBytesTotal();
num = int(perc) + “%”;
perc = (loaded/total)*100;
bar._width = perc;
if(loaded == total && dummy == 1){
_root.text._alpha = 0;
_root.now = 1;
//trace(“dja”);
}
}

Then i have on my frame action

clip.loadMovie(“drive.swf”);
clip._alpha = 0;
now = 0;
text.dummy = 1;

//now load the external file into the myData object
myData.load(“drive.txt”);
stop();

Now it works great but when you go throught the frames and let it sit for about 30 seconds with out hitting a next or previouse to load the next swf it dissapears and then after about 30 sec it reapears and keeps doing it.

Can some one please help?

Thanks!