files attached, thank you

question is why does this keep happening? how can it be fixed? what should i avoid?

i also get this error on a different computer with 2 gtx1080ti

file attached

I've been working with octane for the past 4 years.
i was hoping that by version 4. these kind of errors would stop.

it would happen when in live preview.
it would happen after a long render, sometimes after only one action.
it would happen while doing something "too fast" in live ...