My materials are acting strange. Pls Help

My materials keep glitching. they work fine but then smudge up or go low res? the pics are an example of a floor messing up. If I open the actual texture it seems to fix it but not for long.
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Mesh Made in 3ds max. Textures in substance. Older materials seem to work but not the new ones.

well how are the mipmaps? your engine settings? LOD settings on the meshes? these are the first things I’d check in your spot.
read some of this Texture Properties | Unreal Engine Documentation