Something unpublishes streams in server, how to know what is that?

Some time after i start streaming my video something happens and my stream is getting unpublished. I get record about that in live log in admin console and i get event NetStream.Player.UnpublishNotify in code, but i didn't ask server to unpublish my stream.

We tried to test what event triggers that event. We have only one function in code that unpublishes streams and it is not being called, we are pretty sure.

Sometimes it stops working after 1-10 seconds after we start streaming, sometimes it does not at all (we probably dont wait long enough).

We tried to debug it with swf debugger, but it does not show stacktrace from UnpublishNotify.

Have you any ideas what can it be or how to find problem.

Thank you.