Animation problem (buckets fail) 3ds+vray

[Dark Band Studio]

Hello,

I'm rendering an animation with DR in 3DS+Vray of 300 frames.

I calculate before the LC and the IM and then I run the final render process through the DR.

Vray starts rendering alright the first 20/30 frames but after that, the DR start failing to render all the VrayProxies (I have many Proxies for trees and furniture). Basically, you will see the proxies missing in some buckets after some frames rendered perfectly.

 

Everything is merged in scene so NO XREF scene or objects.

Once I spot the DR making a mess with the frames, I if stop the process and I just try to re-render the failing frame (without touch anything in the scene or in the settings), it cames out perfectly with no problems.

 

do you have any idea what's going on ?????