I can leave a render overnight in order to get up to sufficient number of samples. In the morning, I pause the render in order to have a look at the final result. Here is where the lottery starts. I would say that 25% of the time, when I zoom into the image, Octane goes into a "not responding" state. It simply stays in this state until I shut it down. So my all night render has been wasted

If anyone has a solution, even better.