I have encountered more than one instance where the RTMP stream suddenly stops without any notification. If I am looking at ManyCam, I can start the stream again. However, I usually hide it when I start the stream. There are no settings to notify me if the stream ends abruptly.
There should be a setting that would enable a popup message if the stream ends without me manually ending it. At the moment, I am simultaneously recording to disk while streaming as a backup if it disconnects again in the future.