Limit To Number Of Times Assign EventListeners?

I've got a presentation that continually reads an XML and displays content based on that. It works fine for 2-3 hours then just stops. No errors, just stops.

What I'm doing is adding and removing eventListeners throughout the process using two alternative loader objects.

For example:

PHP Code:

slideLoader1.contentLoaderInfo.addEventListener(Event.COMPLETE,loadJPG, false, 0, true ); 

I started using the "weak" listener based on what I've been reading about garbage collection, but actually this works better:

PHP Code:

slideLoader1.contentLoaderInfo.addEventListener(Event.COMPLETE,loadJPG); 

The presentation runs much longer with the second listener type. In both cases I'm removing it this way:

PHP Code:

slideLoader1.contentLoaderInfo.removeEventListener(Event.COMPLETE,loadJPG); 

Is there a problem constantly adding/removing eventListeners this way?