Calling QMediaPlayer::setMedia 2nd time causes Symbian MMFControllerProxyServer-2b7 to panic

Code that causes this panic in MMFControllerProxyServer:
QMediaPlayer *m_mediaplayer = new QMediaPlayer;
m_mediaplayer->setMedia(QUrl::fromLocalFile("path/to/audiofile1.mp3");
m_mediaplayer->play(); // <-- so far everything works, audio plays ok
...
// here you can do pause() or stop(), don't know if that matters
...
m_mediaplayer->setMedia(QUrl::fromLocalFile("path/to/audiofile2.mp3");
// ---> PANIC

In Windows 7 build there are no problems.