Removing UI Loader from the stage

I have 5 GoToframe activated UI loaders that appear on stage when a btn is clicked. All work fine except when either video galleries are clicked (there are two) . After the video gallery appears on stage any button clicked after that adds the next UI loader but the video gallery remains playing.

Do I use a removeEventListener?

Do I use on all buttons?

Create separate functions?

Any help which code and where to put????

here is the code to one of the galleries

this.stop();

btnGallImg.addEventListener(MouseEvent.CLICK, vgall2);

function vgall2(evt:Event):void {

    gotoAndStop("gallery2");

}