Problem of the Multi-point publishing unstability

I have a problem with stability of the Multi-point publishing of my stream.

I send the stream1 to the server application  "livestreams" -

application.onPublish = function(client, myStream) {

trace(myStream.name + " is publishing into application " + application.name);

if (application.name == "livestreams/_definst_"){

nc = new NetConnection();

nc.connect( "rtmp://localhost/livestream" );

ns = new NetStream(nc);

ns.onStatus = function(info) {

trace("Stream Status: " + info.code)

if (info.code == "NetStream.Publish.Start") {

trace("The stream is now publishing");

}

}

ns.setBufferTime(2);

ns.attach(myStream);

ns.publish(stream2, "live" );

}

}

My flash player plays this stream2 from server application "livestream" during 2-5 minuts, and stream2 vanishes.
Is there methode provides stability of the Multi-point publishing?