And in which version of the engine do you render?
I did in version 4.24 and 4.23. They change very often and sometimes in newer ones everything will work out?
Delay next frame.
This is the delay between frames. Try 2-5 seconds, then after the screenshot, nothing happens for 2-5 seconds, all the cameras are deactivated, then a new frame starts and all the cameras are activated, a screenshot is taken, and so on.
This allows you to avoid loading the video card with a fast stream of frames.
My settings = 2 seconds, if 0,5 for 16384px (very big size) => engine crashed.