Mental Ray Bucket Rendering Crashes with Fatal Error

[unluckynelson]

Hi all
I have MR network rendering setup and it works fine for the first few frames or maybe only one frame... (it's inconsistent)

Then it crashes with the following error:

Mental ray fatal error:
metal ray has encountered a fatal error and the application will now shutdown. The error is: PHEN 4.0 fatal 051500: interrupted by exception code 0xc0000005 (access violation)

Using less render nodes, like only 2 proves more stable. It's also not one of the nodes that's causing it because I'm tested different nodes.

Any ideas on what might cause this issue?