I used a similar feature in another application. Unfortunately the 'I'm going to close down' option didn't work when the app. threw up an error (while you were asleep). Instead of the App. just writing out to an error log and shutting down, it insisted on sitting there waiting for you to do something for hours until you woke up.

I'd be interested to know if you forced a render error part way along the time line in S12, does it still shuts down?