Android TCP multicast missing message

I build a TCP multicast chat application using asynctask. I am also trying to order the message in FIFO and causal order.

However, when I try to send a lot of messages simultaneously for testing, it misses some messages but I can't find the reason. I have tried as hard as I can to improve the performance of the program because I thought the performance could be the reason. but still having the same issue. I attached some important part of my code. Most of all,

    private class ServerTask extends AsyncTask<ServerSocket, String, Void> {

    @Override
    protected Void doInBackground(ServerSocket... sockets){
        ServerSocket serverSocket = sockets[0];
        Socket socket = new Socket();
        try {
            while(true) {
                socket = serverSocket.accept();
                InputStream inputstream = socket.getInputStream();
                DataInputStream in = new DataInputStream(new BufferedInputStream(inputstream));

                String msg = ""+in.readUTF();
                String time = ""+in.readUTF();

                String temp = time+"||"+msg;
                publishProgress(temp);
                in.close();


            }} catch (IOException e) {
            e.printStackTrace();
        } finally{
            try {
                socket.close();
                serverSocket.close();////
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        return null;
    }

Here is onProgressUpdate.

        protected void onProgressUpdate(String...strings) {
        /*
         * The following code displays what is received in doInBackground().
         */
        String strReceived = strings[0].trim();
        TextView remoteTextView = (TextView) findViewById(R.id.textView1);
        remoteTextView.append(strReceived + "\t\n");
        try {
            sequencer(strReceived);
        } catch (ParseException e) {
            e.printStackTrace();
        }


        return;
    }
}

Sequencer

    public void sequencer(String received) throws ParseException {

    SimpleDateFormat date = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss.SSS");
    String time = received.split("\\|\\|")[0];
    String msgToSend = received.split("\\|\\|")[1];
    Date newDate = date.parse(time);
    Timestamp timestamp = new Timestamp(newDate.getTime());

    msgMap.put(timestamp,msgToSend); // Treemap that allows to put messages in order according to timestamp
    int k = 0;
    String key;


    for(String value : msgMap.values()){

        key = String.valueOf(k);
        k++;
        ContentValues keyValueToInsert = new ContentValues();
        keyValueToInsert.put("key", "" + key);
        keyValueToInsert.put("value", value);


        Uri newUri = getContentResolver().insert(
                Uri.parse("content://lebanner.provider"),    // assume we already created a Uri object with our provider URI
                keyValueToInsert
        );


    }

}

Finally here is my Client Task..

   private class ClientTask extends AsyncTask<String, Void, Void> {

    @Override
    protected Void doInBackground(String... msgs) {

        Date currentDate= new Date();
        Timestamp time = new Timestamp(currentDate.getTime());
        Message temp = new Message(myPort, msgs[0], time);////
        try {

            for(int i = 0; i <= 2; i++) {
                Socket socket = new Socket();
                socket.connect(new InetSocketAddress(InetAddress.getByAddress(new byte[]{10, 0, 2, 2}),
                        Integer.parseInt(REMOTE_PORTS[i])), 1000);
                socket.setTcpNoDelay(true);
                OutputStream outputStream = socket.getOutputStream();
                DataOutputStream o = new DataOutputStream(new BufferedOutputStream(outputStream));

                o.writeUTF(msgs[0]);
                o.writeUTF(""+time);
                o.flush();////
                socket.close();
            }
        }
        catch (UnknownHostException e) {
            Log.e(TAG, "ClientTask UnknownHostException");
        } catch (IOException e) {
            Log.e(TAG, "ClientTask socket IOException");
        }

        return null;
    }

Can you find the part causes the problem?