Is this not why , gimp and ps have a batch function - However, as stated I'm in guessing and assumptions. You could very well have a script error causing a memory issue as many have stated. And to note the idea that wait(1) and the function schedule list is the error makes me laugh. It is the oldest and primary core of This real-time engine.

However, I'm so drunk it took 30 mins to write this and correct the typos.
Game-on , have fun
Mal