I’ve discovered that Sonic Pi will break or exit out of while loops that run for too long. It would be nice if this behavior could be disabled in the “prefs”.
However, I realize that Sonic Pi is not supposed to be a general purpose IDE, so this request doesn’t deserve high priority. This feature would probably only be useful for complex tasks that need to be computed in a separate buffer prior to playing music. I have experimented with something that could theoretically require this but not yet in practice.