A complain about ESC=Stop Rendering

You are right, there’s also that issue, but it is of a technical order, it have to finish the sample before stopping.
Anyway it is far less dangerous and annoying than the opposite.

BTW, the rendering of that scene is now at 500 samples in 6 hours, with Bounces set to max=16, min=8.
Sadly it is not looking at all the same as before.