Okay, so it did eventually finish and the problem didn't occur again. Unless I accidentally fixed it some other way, switching from material node assignment to geometry assignment did the trick.

I did get several seg faults and crashes during the render, mostly between frames. I'm not sure if this ...

Hi Juanjo,

Thanks for the suggestions.

I had already tried running the render with Full Scene Reload on and was still getting this issue. I went ahead and did it again with debug logging. After the problem occurred I looked at the log and noticed some errors.

I get this one a few times ...

Updating drivers did not resolve the issue.

I saw that there were some new Nvidia drivers released the other day so I'm trying 425.31.

I've built a scene and set it up to render several frame ranges. The first few frames will usually look fine so I let it go. However usually at some point in the frame range some of the geometry will disappear and sort of create a hole through the scene (see pictures). I have had renders complete ...