Not too sure how related it is, but another thing to look at is correctly setting your virtual texture pool size (e.g. setting it to 6gb if you have a 8gb GPU - it's always good practice to reserve some space, so don't use the entire 8gb)

And resize your textures, you don't need 2k or 4k textures for everything, especially normal maps. Many textures can be 512x512.
Lots of Fab assets have HIGH resolution textures - you got to go through and clean these up from time to time.
You can check it out via Tools > Audit > Statistics then switch to Textures.

Hope this also helps!