Weirdly, setting the time setting to 0 and the iteration to a high number like 800 has reduced the amount of crashes.
While this increases the render time it also increases quality and actually saves time due to no longer having to restart rendering 15/20 frames at a time.
Now I can finally put things to render overnight.
This has been an issue for a while and we have not seen any solution or even acknowledgement from the developer team.
I have personally started learning UE4 to move on from iray and will use Nvidia Omniverse if they improve facial animations.
Iclone 8 looks like it’s going to be a dud and no-buy for me as I have been burned with the iclone suite. CC3 being the only saving grace.