Sounds like Texture Streaming issue. Check the Textures you are using for this asset and be sure you have Mips enabled. Mip levels will not be generated for non-power of two textures i.e…2048, 1025, 512, 256, 128 etc…
Below is a picture of where to look for viewing and editing your textures to have the correct mip levels. If you need further help take a look at our documentation which goes into greater detail explaining Mips and Texture Compression.
Texture Streaming
Texture Settings
Cheers,