Can't build for Windows (hold on window and cycling through prefabs)

This is how it looks, it just keeps on cycling through the prefabs over and over. I even tried leaving it overnight, but it saw it got stuck in the morning.

I tried bulding in 2018.3.7 and in 2018.3.10, it's the same, unity just keeps geting hold of more and more memory, from 800mb to 3gb and rising. Something's definitely wrong.



Any ideas? So far i tried reimporting the assets, but it didn't help.