loadVars

I am having a weird “Page not found” error occur when using loadVars. I have an avatar where you can change differt features on the face. The error happens when I try to save an update to the avatar. This is a random error, it does not happen every time I try to save. The only way I can get it to come up on some what of a consistent bases is by waiting a minute before trying to save. The features are passing back and forth by a query string to an ASP page. The query string is over 1700 characters long. Below is the code I am using for the save:

var saveavatarData:LoadVars = new LoadVars();

saveavatarData.onLoad = function(success:Boolean) {
if (success) {
testtext.text = "Success = "+savedString;

} else {
testtext.text = “Error loading/parsing LoadVars.”;
}
};

saveavatarData.load(“SaveAvatarVars.asp?id=” +UserID+"&"+savedString);