Basic tutorial 5 -> Strong range activity blocks stream

In the tutorial, my only change is that I play an MP3 instead of a video. This actually works well.

 g_object_set (data.playbin, "uri", "file:///home/tux/Schreibtisch/gsteramer1/test.mp3", NULL);

So now to the problem. If I perform a strong activity on the scroll bar, e.g. grab it with the mouse and move it back and forth a few times, the stream freezes. But it’s not always the same. Sometimes two movements are enough, but it can also be more than 20.
And the output is then, as expected, alternating “State set to PAUSED”, “State set to PLAYING”.

Usually when I press stop and play again, it starts working again.

What could be the reason?

With the original video, I can also do this if I play with the scroll bar for long enough. Everything runs much more slowly.

I noticed this effect during my own experiment, so I tried the tutorial as well.