In an ATK two-probe transmission spectrum analyses over a voltage loop, the job running suddenly stopped after zero bias data. Shows no error, no progress over past three days (first run is at 0.1 V and zero bias data obtained after 1 day). This is astonishing and when we have give 'top' command in our linux machine each time it shows atk jobs are running. But no progress any where over 3 days. Kindly help.