Hey,
I had similar problems, when my UV islands where scaled very big or far off the center of my map in Max.
Instead of scaling the islands I used higher tiling values on my texture map
and made sure that the islands where located close to the 0 to 1 space in UV Editor.
After exporting the model again and reimporting in Unreal the problems were gone.
You may have to adjust your materials TextureCoordinate node for the correct tiling values.
Hope that helps. 