I am using octane2020.1.5.3 for houdini18.351 on linux to render a volcano scene. The video is attached with the post.
I found that the explosion smoke on the right side start flashing and gernerating artifacts on frame 77. It became so obvious around frame 125.
I am using pathing tracing mode, and all the volumes are vdb format. And my CPU is i7 9700K, with 64G RAM, GPU is RTX2080Ti.
Appreciation to any advice.