My button function seems to work only once

Question

When I tell Flash to go back frames the buttons cease to work, in other words, the button only works once. I've tried tracing it to find the problem and when I tell it to go back frames it won't run the function.  I'm using actionscript 3 on Flash CS4.
hap.addEventListener(MouseEvent.CLICK,clickFunction2);
    trace("addEventListener worked!");
function clickFunction2(evt:MouseEvent):void {
    trace("clickFunction2 worked!");
this.gotoAndPlay(191);
    trace("gotoAndPlay worked!");
sad.addEventListener(MouseEvent.CLICK,clickFunction3);
    trace("addEventListener worked!");
function clickFunction3(evt:MouseEvent):void {
    trace("clickFunction3 worked!");
this.gotoAndPlay(1,"sadness");
    trace("gotoAndPlay worked!");
ang.addEventListener(MouseEvent.CLICK,clickFunction4);
    trace("addEventListener worked!");
function clickFunction4(evt:MouseEvent):void {
    trace("clickFunction4 worked!");
this.gotoAndPlay(1,"anger");
    trace("gotoAndPlay worked!");
rewind.addEventListener(MouseEvent.CLICK,clickFunction5);
    trace("addEventListener worked!");
function clickFunction5(evt:MouseEvent):void {
    trace("clickFunction5 worked!");
this.gotoAndPlay(120,"happiness");
    trace("gotoAndPlay worked!");

Answer 1

Thanks for the answer.  I was having the same issue with something I was writting.  I was wondering, if it would be better to remove eht event listener and then add them after the frame has changed.
Would one approach be bettor or worse that the other.
-Thanks