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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 preview
sometimes a scene would run ok for a week of working
then it would give this error, out of nowhere, nothing had changed and i have to start removing parts that didn't cause any problem before...
this is really frustrating, a lot of my work is on big scenes with detailed machinery, i optimize the hell out of everything and still that error shows up and crashes the scene.
there's no specific scene to look at as i feel this is very sporadic.

it happens in cinema 4d r18-19-20
all of octane versions through the years, now i''m using 'octane 4

comp specs:
Intel Xeon E5-2680 V3 2.50GHZ
64BG RAM
NVIDIA Geforce GTX 980Ti x2

thank you

OK what's your question?

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

We can't know without seeing bugreports and log outputs. Capture a few bugreports.zip and activate all log options and send me c4doctanelog.txt's and bugreport.zips.
Also you may fall to LOW VRAM issues, always check triangle amounts and free room for VRAM.

files attached, thank you

I don't think you sent a proper c4doctanelog.txt from the moment of crash. Can you please try again the crash and send again?
Also give me proper information about crash how you did it? And also a scene.

And I see you're not using latest build. Give a try to version 4.04 and drop some feedback
viewtopic.php?f=85&t=71355