~200 of 3000 frames fail to render?

[Norton]

I'm using 2.04 and after several thousand frames of rendering, 200 or so don't seem to render. The octane render viewport just says "WARNING RENDER IS FAILED."

The scene size is ~2.3gb which is well below the limit of my 6gb titan and there is effectively no difference between the last thousand frames, the 200 borked frames, and the following thousand frames which seem to render withtout a hitch.

Also, if I change octane versions to 2.2x, the frames render but the camera exposure and color response is dramatically different and so the output is unusable.

Anyone know what the issue might be?