vod stream disconnects after 100 seconds of pause

I'm using  fms 4.5 vod application to play rtmp stream in flex Video Display client.When the video is paused for 100 seconds the stream gets disconnected from server.its not resuming when the play method is invoked.The player's state is changing to 'playing' but the video is not playing. I tried the same client with fms 4.0 and it starts playing when the play method is invoked after disconnection.Can any one help to resume the video with fms 4.5?