Memory leaks while playing mp3 in air 1.5

Hello,
I am trying to develop an mp3 player using Adobe Air (html + javascript). When I repeatedly load files using Sound class, memory usage is constantly increasing. I have observed this on OS X 10.6. using Activity Monitor. Air runtime is 1.5.3.9120
Steps to reproduce:
1. Load the sample below with adl
2. Click on play. Observer memory usage of adl in Activity monitor
3. Click on stop. The memory doesn't get reclaimed.
Keep repeating steps 2 and 3 and observe the memory in Activity monitor.
Any ideas as to why this happens? What am I doing wrong?
Regards,
Sasa
The example:
<html>
<head>
    <script type="text/javascript" src="AIRIntrospector.js"></script>
    <script type="text/javascript" src="AIRAliases.js"></script>
    <script type="text/javascript">
      function play(){
        var req = new air.URLRequest("file://test.mp3");
        snd = new air.Sound(req);
        //channel = snd.play();
      function stop(){
        //channel.stop();
        //channel = null;
        snd = null;
      function init(){
        document.getElementById('play').onclick = play;
        document.getElementById('stop').onclick = stop;
    </script>
</head>
<body onload="init();">
    <div id="play">play</div>
    <div id="stop">stop</div>
</body>
</html>

Normally I would agree about letting the gc collect. However, in my case, memory usage increases to 300 MB after 8 hours of playing. It seems that GC didn't collect or I have some more leaks.I didn't have the time to investigate this some more.
However, if gc doesn't collect for such a long time (possibly because there is more than enough free memory), I would prefer to invoke collection myself. If for no other reason, than because it doesn't look good for the end user to have perception that my app is using 300 MB when other applications are using only couple of MB up to 100 MB in the worst cases.

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