gray polys, random texture issue rendering animation. VRay GPU Maya

[patrick_ortman]

When I render an animation, the object that is moving sometimes shows "dead" or gray polygons on its surface. For instance, I am rendering a 10 second clip and every few frames I have one where a random polygon on the character turns gray. The character has a very simple VRay Material assigned, just a color. I am rendering using Progressive. Any ideas how to fix this bug? Is bucket "safer"?

[patrick_ortman]

Here is a picture to explain the gray polygon. It shows up random all over the mesh in animation.

[patrick_ortman]

Update: bucket does the same as progressive. The polygons that turn gray are definitely random but only on the moving character.

[patrick_ortman]

My theory is maybe my RTX 3090 somehow runs out of memory with the scene (unlikely! But, maybe). So I am trying to render the sequence using CPU.

[hermit.crab]

Are we talking about the grey spot below the duck's beak? Maybe you could send the scene via the contact form so we can troubleshoot it. Mention me and include a link to this thread in the message.