Buttons stop working after 2 clicks of any buttons ??

Question

i've pasted in the action script below thats causing the problem and a shot of the timeline ... i'm really new to flash (this is my first atempt actually) ... Its driving me a bit nuts as all i'm trying to do is make a load of buttons work.
At the moment what happens in browser preview is that i can click two or sometimes only one button (doesnt matter which) and from that point on none of the buttons work any more ...
It seems like a common problem from what i have read around the web but i cant find an answer ...
can anyone help please !?
ps: it was working previously until i entered more (currently uncoded, but with rollovers) buttons onto frame 2 (all sitting within menu2 layer)..
import flash.events.MouseEvent;
stop();
home_btn.addEventListener(MouseEvent.CLICK, gohome);
comm_btn.addEventListener(MouseEvent.CLICK, commmenu);
leis_btn.addEventListener(MouseEvent.CLICK, leismenu);
hotel_btn.addEventListener(MouseEvent.CLICK, hotelmenu);
resi_btn.addEventListener(MouseEvent.CLICK, resimenu);
product_btn.addEventListener(MouseEvent.CLICK, productmenu);
health_btn.addEventListener(MouseEvent.CLICK, healthmenu);
retail_btn.addEventListener(MouseEvent.CLICK, retailmenu);
educ_btn.addEventListener(MouseEvent.CLICK, educmenu);
environ_btn.addEventListener(MouseEvent.CLICK, enviromenu);
contact_btn.addEventListener(MouseEvent.CLICK, contactmenu);
history_btn.addEventListener(MouseEvent.CLICK, historymenu);
function gohome (event:MouseEvent):void{
gotoAndStop(1);
function commmenu (event:MouseEvent):void{
gotoAndStop(2);
function leismenu (event:MouseEvent):void{
gotoAndStop(3);
function hotelmenu (event:MouseEvent):void{
gotoAndStop(4);
function resimenu (event:MouseEvent):void{
gotoAndStop(5);
function productmenu (event:MouseEvent):void{
gotoAndStop(6);
function healthmenu (event:MouseEvent):void{
gotoAndStop(7);
function retailmenu (event:MouseEvent):void{
gotoAndStop(8);
function educmenu (event:MouseEvent):void{
gotoAndStop(9);
function enviromenu (event:MouseEvent):void{
gotoAndStop(10);
function contactmenu (event:MouseEvent):void{
gotoAndStop(11);
function historymenu (event:MouseEvent):void{
gotoAndStop(12);

Answer 1

if you click comm_btn and go to frame 2, any buttons that no longer exist on frame 2 will lose their listener.
to remedy, all your buttons should be created in frame 1 and placed in a layer that has no other (than 1) key frames.
if you don't want a button (eg, comm_btn) to be visible to users when you are in frame 2, for example, you can use:
comm_btn.visible=false;
// or
removeChild(comm_btn);
in a frame where you want comm_btn to be visible, use:
comm_btn.visible=true;
// or
addChild(comm_btn);