Actionscript 3 simple jigsaw puzzle question

Hello, I am attempting to modify a tutorial on jigsaw puzzles to my own needs. I am very new to AS3

What I am trying to do is very simple (I believe), I have a 6 piece jigsaw puzzle and after every piece is placed in the correct spot I would like it to lock it down and play a wav file.

the code I am using for each piece is:

_________________________________________

stop();

import flash.events.Event;

import flash.events.MouseEvent;

stage.addEventListener(Event.ENTER_FRAME,EntFrame);

function EntFrame(e:Event):void

{

    //piece1

    Piece1_mc.addEventListener(MouseEvent.MOUSE_DOWN, DragP1);

    function DragP1(event:MouseEvent):void

    {

        Piece1_mc.startDrag();

    }

    stage.addEventListener(MouseEvent.MOUSE_UP, DropP1);

    function DropP1(event:MouseEvent):void

    {

        Piece1_mc.stopDrag();

    }

    if (Targ1_mc.hitTestObject(Piece1_mc.Tar1_mc))

    {

        Piece1_mc.x = 260.90;

        Piece1_mc.y = 432.80;

        gotoAndPlay(2)

        audio_mc.gotoAndPlay(2);

    }

}

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The issue seems to be that the audio file continues to play over and over since the Targ1_mc is constantly registering as hitting.

Locking the pieces is also an issue, I have tried to replace the Piece1_mc on the frame 2 with a still version of the puzzle piece but then I get a #1009 error and lose all code functionality, I am guessing this is due to my needing to removeEventListener but I am not sure how to go about that.

I hope this makes sense to someone, thank you in advance.