BlackBerry Curve not enough storage exception - file

Question

I have an application that downloads a video file that is roughly 6mb
I am trying to run this application on a Blackberry Curve 9360, which has 32mb of "media" storage
Sometimes this application runs and is able to download the video with no problems, however other times part way thru downloading the download process fails with an IO exception that states: "There is not enough free memory on the file system to complete this action"
after it fails in this manner I can open up the BlackBerry Desktop software and check the files section and see that the device is indeed reporting that 32/32 mb are full.
If I then restart the device with alt-shift-del and open up blackberry desktop software again the used space has shrunk back down to only 5-6 / 32mb full
Sometimes at this point I am able to run my application now and have it succeed the download, but other times it again gives me the same storage full error. The only thing I can notice that seems like it might be affecting whether or not it fails is how long the download takes total (i.e. it succeeds on wifi, and on good 3g signal and fails on poorer 3g signal, but this is anecdotal at best)
I have used this exact same application on a few different blackberry devices, including a few other Curve devices with the same storage size, and never run into this problem before.
My question is: Has anyone seen a BlackBerry curve device behave in such a way that it will report an incorrect storage space that gets fixed by a reboot?
And is there anything about this download code that could be causing this behavior?
class DownloadThread extends Thread {
public void run()
{
HttpConnection httpConn = null;
InputStream is = null;
try{
httpConn = (HttpConnection)Connector.open(videoUrl + ";interface=wifi");
is = httpConn.openInputStream();
}catch(IOException e){
try{
httpConn = (HttpConnection)Connector.open(videoUrl);
is = httpConn.openInputStream();
}catch(IOException ioe){
System.out.println("891: "+e.toString());
}
}
try{
if (!videoFconn.exists())
videoFconn.create();
else{
videoFconn.delete();
videoFconn.create();
}
OutputStream os = videoFconn.openOutputStream();
lengthOfWebFile = httpConn.getLength();
total = 0;
System.out.println("##################### length of web file = " + lengthOfWebFile + " #################");
byte data[] = new byte[256];
while ((count = is.read(data)) != -1) {
total += count;
progress = (int)(total*100/lengthOfWebFile);
if(model.getValue() < progress){
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
EmbeddedMediaScreen.this.model.setValue(progress);
}
});
}
//write this chunk
os.write(data, 0, count);
Thread.yield();
}
os.flush();
os.close();
is.close();
httpConn.close();
lengthOfLocalFile = videoFconn.fileSize();
System.out.println("###################### Local Length = " + lengthOfLocalFile + "#####################");
if(lengthOfLocalFile == lengthOfWebFile){
amDownloading = false;
startVideo();
}else{
downloadVideo();
}
}catch(FileNotFoundException fnf){
}catch(IOException e){
//ScreenSaverActivity.errorDialog("975: "+e.toString());
System.out.println("980: "+e.toString());
//e.printStackTrace();
}catch(NullPointerException npe){
System.out.println("983: "+npe.toString());
} /*catch (InterruptedException e) {
// TODO Auto-generated catch block
System.out.println(e.getMessage());
}*/
}
public synchronized void postProgress(final int p){
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
//Set the progress bar
EmbeddedMediaScreen.this.model.setValue(p);
}
});
}
}