To add to the documented cases -
I've had a similar problem on a new 16" MBP with 8gb Radeon and 64gb system memory.
A few times C4d has crashed because of a "Graphics driver error" and one time while rendering in Prorender the whole machine suddenly shut down with a very quick and loud burst of the coolers. Only experienced that once.
Other than that, rendering in Prorender works for me.
Will be keeping an eye out for similar problems. Please keep us posted if you find out it's a hardware problem.