Issue with using RVT for our grass, strange artifacting seemingly at random

Hey, we are getting this strange bug with our grass.
-RVT is sampling base colour from landscape and applying it to our grass material.

-Seemingly at random it will start bugging out and causing this artifacting you can see in the screenshot, artifacts are usually in large square shapes

-Streaming texture pool is set to 1000mb and stats say the required pool is only at 78mb so I dont think its a streaming texture budget issue.

-The resolution of our RVT is 256, our landscapes are only small islands and increasing this doesnt seem to help with the issue

any one else encounter this issue before?

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