Почему теряются пакеты по UDP

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
#include"windows.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_senderButton_clicked()
{
    Send(ui->lineEdit->text());
    Send(ui->lineEdit_2->text());
    Send(ui->lineEdit_3->text());
}
 
void MainWindow::Send(QString str)
{
    QByteArray dataGramm;
    QDataStream out(&dataGramm, QIODevice::WriteOnly);
 
    out<<str;
 
    dataGramm.append(str);
    socket.writeDatagram(dataGramm, QHostAddress::LocalHost,26000);
    dataGramm.clear();
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    udpSocket.bind(26000);
    connect(&udpSocket,SIGNAL(readyRead()), this, SLOT(GetUdpPacket()));
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::GetUdpPacket()
{
    QByteArray dataGramm;
    QString text;
 
    do
    {
        dataGramm.resize(udpSocket.pendingDatagramSize());
        udpSocket.readDatagram(dataGramm.data(), dataGramm.size());
    } while(udpSocket.hasPendingDatagrams());
 
 
    QDataStream in(&dataGramm,QIODevice::ReadOnly);
    in>>text;
    ui->textEdit->setText( ui->textEdit->toPlainText()+ text + '\n');
}