If you can grab video on what it does before it dies it would be helpful. only reason would be you are on a low eat at %
As for the client stopping it looks like the random event for the game lobby isnt working properly. it should click the 'click here to play button' before attempting to reloop the script.
I'll try testing this myself sometime today.
I didn't change anything so yes it will always be working. Anytime there is a problem with the script is if I accidently push a bad update, the client isnt on a stable build (Runescape gameupdates), or things are removed from the API.
Otherwise please use the bug report form located on my alt thread which is located on the main thread.