Handle leack, memory leack

Memory leaks while using functions QMediaPlaylist:: setCurrentIndex, QMediaPlayer::play.

MainWindow::MainWindow( QWidget *parent )
    : QMainWindow( parent )
    , ui( new Ui::MainWindow )
{
    ui->setupUi( this );

    mp = new QMediaPlayer();
    mp->setVolume( 50 );
    pl = new QMediaPlaylist();

    pl->addMedia( QUrl::fromLocalFile( "FILEPATH.wav" ) );
    mp->setPlaylist( pl );
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_clicked()
{
    QTimer *timer = new QTimer();

    connect( timer, &QTimer::timeout, this, [=]()
    {
        pl->setCurrentIndex( 0 );
//        mp->play();
    });

    timer->start( 500 );
}

Output message:

shell\osshell\lmui\ntshrui\dll\shrengine.cpp(1487)\ntshrui.dll!00007FFDC62B94D0: (caller: 00007FFDC62E390F) ReturnHr(1) tid(13b4) 80004005 Unrecognized error

shell\osshell\lmui\ntshrui\dll\shrengine.cpp(1487)\ntshrui.dll!00007FFDC62B94D0: (caller: 00007FFDC62E390F) ReturnHr(2) tid(13b4) 80004005 Unrecognized error

shell\osshell\lmui\ntshrui\dll\shrengine.cpp(1487)\ntshrui.dll!00007FFDC62B94D0: (caller: 00007FFDC62E390F) ReturnHr(3) tid(13b4) 80004005 Unrecognized error

etc...