PHP file upload gets failure when using wireless broadband?

When Using the wireless b开发者_如何学Pythonroadband the file more than 97 kb gets failure and php error code return 3.That is for file upload partially.It only happens for the wireless network(using USB modem).If I am using the wired connection it works fine.

1. What are the reasons for error code 3 in php?
2. why my file failure in wireless network only?

below I pasted my php code.Front end we are using flex.

   ini_set("max_execution_time",172000);
   $filep=$_FILES['Filedata']['tmp_name'];
   $name=$_FILES['Filedata']['name'];
   $name=str_replace(" ","_",$name);
   $path=$_SERVER['DOCUMENT_ROOT']."unittesting/".$name;

   $test=move_uploaded_file($filep,$_SERVER['DOCUMENT_ROOT']."unittesting/".$name);

This is a network layer issue and nothing at all to do with PHP. Perhaps you'd have better luck asking on superuser.com ?