AS3 Socket FTP over a 3G network

I have an AS3 socket script to connect and retrieve data from a FTP account. It works fine when the device is connected to a WIFI or LAN network. The problem is that when the device is connected to a 3G network the my script fails 90% of the times. There must be some kind of DATA LOSS. I need to detect that data loss and send data to the server again. If you think you can do that then contact me. Here's my code: import [login to view URL]; import [login to view URL]; import [login to view URL]; import [login to view URL]; import [login to view URL]; // var ftp_host:String="[login to view URL]"; var ftp_port:Number=21//or your ftp port; var ftp_username:String="username"; var ftp_password:String="password"; var ftp_path:String="/"; var s,r; var listOfFiles:Array; // readFromFTP() function readFromFTP(e=null){ s = new Socket(ftp_host,ftp_port); r = new Socket(); [login to view URL](IOErrorEvent.IO_ERROR,onIOERR); [login to view URL](ProgressEvent.SOCKET_DATA, onReturnData); [login to view URL](SecurityErrorEvent.SECURITY_ERROR,onSecERR); [login to view URL](ProgressEvent.SOCKET_DATA, onServData); [login to view URL]([login to view URL], onPasvConn); [login to view URL](IOErrorEvent.IO_ERROR,onIOERR); [login to view URL](SecurityErrorEvent.SECURITY_ERROR,onSecERR); [login to view URL](UncaughtErrorEvent.UNCAUGHT_ERROR, handleGlobalErrors); } function onReturnData(evt:ProgressEvent) { var d = [login to view URL]([login to view URL]); trace(d); [login to view URL](d); if([login to view URL]("220 ")>-1){ [login to view URL]("Username sent\n"); [login to view URL]("USER "+ftp_username+"\n"); [login to view URL]() } if([login to view URL]("331 ")>-1){ [login to view URL]("Password sent\n"); [login to view URL]("PASS "+ftp_password+"\n"); [login to view URL]() } if ([login to view URL]("230") > -1) { [login to view URL]("PASV command sent\n"); [login to view URL]("PASV \n"); [login to view URL](); } var a = [login to view URL]('227'); if (a > -1) { var st = [login to view URL]("(",a); var en = [login to view URL](")",a); var str; str = [login to view URL](st + 1,en); var a2 = [login to view URL](","); var p1 = [login to view URL](); var p2 = [login to view URL](); var ip:String = [login to view URL]("."); var port:int=(p2*256)+(p1*1); [login to view URL](ip, port); } if([login to view URL]("226 ")>-1){ [login to view URL]("QUIT command sent\n"); [login to view URL]("QUIT \n"); [login to view URL](); } if([login to view URL]("221 ")>-1){ } } function onPasvConn(evt:Event):void { //trace("CONNECTED TO DATA PORT"); [login to view URL]("CONNECTED TO DATA PORT\n"); [login to view URL]("NLST "+ftp_path+"\n"); [login to view URL](); } function onServData(evt:ProgressEvent):void { var d = [login to view URL]([login to view URL]); trace(d); [login to view URL](d); } function onIOERR(evt:IOErrorEvent) { trace(evt.errorID+":"+[login to view URL]); [login to view URL](evt.errorID+":"+[login to view URL]); } function onSecERR(evt){ [login to view URL]("Security error\n"); } function handleGlobalErrors(evt){ [login to view URL]("Unhandeled Error\n"); }