Max 2015 animation: A Fatal error occured while rendering with NVIDIA mental ray

[brit_b]

I'm not sure if anyone can help with the old version. I'm still using Max 2015, but I keep getting this error when mid way rendering an animation (usually after about 50 frames are rendered). "A Fatal error occured while rendering with NVIDIA mental ray. This render will abort. NVIDIA mental ray is now in an unstable state and cannot be used any more for this session. 

The error is :

BSP2 0.20   818 MB fatal  551109: 

818 MB fatal  551109: runtime exception 0xc0000005: access violation

It only happens on my laptop, but not on the desktop. Any suggestions?

[brit_b]

Miraculously it now rendered the last 300 frames without a hitch. I did use the CC cleaner registry cleaner, but it could just be one of those things.