Project does not run well with timer

Hi.

I have created one quiz project and everything run well before I add timer function into it. When I hit "pause" timer, the timer stop, the buttons are all disabled for Q1 (this are good as what the quiz was supposed to be). But when I "restart" the timer, to move to the next question, it will redirect me to the last page and end the quiz. It was supposed to redirect me to the next question. Help needed!   Thank you

import flash.display.SimpleButton;

stop();

var pause_btn:SimpleButton;

var finalString:String = '';

//var finalString2:String = '';

var _list:Array = ["Q1", "Q2", "Q3,"Q4,"Q5 ","Q6","Q7","Q8 ","Q9","Q10","Q11","Q12", "Q13","Q14", "Q15", "Q16","Q17", "Q18", "Q19", "Q20"];

var _marks:Array = [];

var i:int;

var myscore = 0;

////////////////////////////////////////////

buttonA.buttonMode = true;

buttonB.buttonMode = true;

buttonC.buttonMode = true;

buttonD.buttonMode = true;

skip_btn.buttonMode = true;

score_txt.text = myscore;

question_txt.text = _list[0];

buttonA.label_txt.text = "A.";

buttonB.label_txt.text = "B.";

buttonC.label_txt.text = "C.";

buttonD.label_txt.text = "D.";

skip_btn.label_txt.text = "Skip";

buttonA.label_txt.mouseEnabled = buttonB.label_txt.mouseEnabled = buttonC.label_txt.mouseEnabled = buttonD.label_txt.mouseEnabled = skip_btn.label_txt.mouseEnabled = false;

buttonA.addEventListener(MouseEvent.CLICK, q1);

buttonB.addEventListener(MouseEvent.CLICK, q1);

buttonC.addEventListener(MouseEvent.CLICK, q1);

buttonD.addEventListener(MouseEvent.CLICK, q1);

skip_btn.addEventListener(MouseEvent.CLICK, q1);

function q1(event:MouseEvent):void

{

  if(event.currentTarget == buttonA)

  {

  _marks.push("Your answer");

  }

  else if(event.currentTarget == buttonB)

  {

  _marks.push("Your answer");

  }

  else if(event.currentTarget == buttonC)

  {

  _marks.push("Your answer");

  myscore+=5;

  }

  else if(event.currentTarget == buttonD)

  {

  _marks.push("Your answer");

  }

  else if(event.currentTarget == skip_btn)

  {

  _marks.push("Skip");

  }

      buttonA.removeEventListener(MouseEvent.CLICK, q1);

   buttonB.removeEventListener(MouseEvent.CLICK, q1);

   buttonC.removeEventListener(MouseEvent.CLICK, q1);

   buttonD.removeEventListener(MouseEvent.CLICK, q1);

   skip_btn.removeEventListener(MouseEvent.CLICK, q1);

  nextFrame();

}

/*myTimer.start();*/

var endTime1:int = getTimer();

endTime1 = 40*60*1000;  //adjust endTime to 40 minutes in the future.

var countdownTimer1:Timer = new Timer(1000);

countdownTimer1.addEventListener(TimerEvent.TIMER, updateTime1);

countdownTimer1.start();

function updateTime1(e:TimerEvent):void

{

    endTime1 -= 1000

    var timeLeft:Number = endTime1;

  var seconds:Number = Math.floor(timeLeft / 1000);

  var minutes:Number = Math.floor(seconds / 60);

  seconds %= 60;

  minutes %= 60;

  var sec:String = seconds.toString();

  var min:String = minutes.toString();

  if (sec.length < 2) {

    sec = "0" + sec;

  }

  if (min.length < 2) {

    min = "0" + min;

  }

  var time:String = min + ":" + sec;

  timer_txt.text = time;

}

// this button will pause the timer using Boolean variable:

var pause1:Boolean = false;

pause_btn.addEventListener(MouseEvent.CLICK, onClick1);

function onClick1(e:MouseEvent):void

{

    if(pause1 == false)

    {

        countdownTimer1.stop();

        pause1 = true;

  buttonA.buttonMode = false;

  buttonB.buttonMode = false;

  buttonC.buttonMode = false;

  buttonD.buttonMode = false;

  skip_btn.buttonMode = false;

  //resume_btn.label_txt.text = "Jeda";

  //buttonA.label_txt.mouseEnabled = buttonB.label_txt.mouseEnabled = buttonC.label_txt.mouseEnabled = skip_btn.label_txt.mouseEnabled = resume_btn.label_txt.mouseEnabled = false;

  buttonA.removeEventListener(MouseEvent.CLICK, q1);

  buttonB.removeEventListener(MouseEvent.CLICK, q1);

  buttonC.removeEventListener(MouseEvent.CLICK, q1);

  buttonD.removeEventListener(MouseEvent.CLICK, q1);

  skip_btn.removeEventListener(MouseEvent.CLICK, q1);

    }

    else

    {

        countdownTimer1.start();

        pause1 = false;

  buttonA.buttonMode = buttonB.buttonMode = buttonC.buttonMode = buttonD.buttonMode = skip_btn.buttonMode = true;

  //resume_btn.label_txt.text = "Mula";

  //buttonA.label_txt.mouseEnabled = buttonB.label_txt.mouseEnabled = buttonC.label_txt.mouseEnabled = skip_btn.label_txt.mouseEnabled = resume_btn.label_txt.mouseEnabled = true;

  buttonA.addEventListener(MouseEvent.CLICK, q1);

  buttonB.addEventListener(MouseEvent.CLICK, q1);

  buttonC.addEventListener(MouseEvent.CLICK, q1);

  buttonD.addEventListener(MouseEvent.CLICK, q1);

  skip_btn.addEventListener(MouseEvent.CLICK, q1);

    }

}

/*var home:Boolean = false;

homeqz1.addEventListener(MouseEvent.CLICK, onClick);

function onClick(e:MouseEvent):void

{

    if(home == false)

    {

        countdownTimer1.stop();

        home = true;

    }

}