Hi John,
Thanks a lot for your reply. I have tried switching rendering to Mercury Engine Software Only, this allowed the render to carry on without stopping for a good 4/5 hours but sadly the same problem just recurred, wasn’t quite enough time to complete the export of my project.
So the issue definitely seems to be overheating (the back of the tower was getting real hot for sure), not sure how to proceed now, never had this issue before?