I believe I have made a breakthrough regarding this issue. It appears that listening to streams is causing the problem. I have just about everything disabled - automation rules, etc. Start the stream - it may be an hour, or several hours - MusicLobby will become unresponsive.
It does appear to be related to interruptions in the stream - the audio drops out and then continues. I have no idea what is going on here but I do know that if I run the system, play MP3's continuously, everything works fine and I have no issues with MusicLobby?
Simon D. S. Mason