yup, I feel strange when I copy and paste the log as i cant see any terminating msg. And this is one of my concern. I have no knowledge/hint on why it is terminated and I fail to replicate terminating condition. Any suggestion?

p.s. the script used(demo.wdl) is A* search contributed in the contribution zone. I have modified it by placing a model and walk to the destination. I wonder if it is the problem of the script as I experienced shutdown running other demos.
And if there is a time limit, how long is it?