UE4 Freezes my pc when building lights

I have a project that was working just fine building the light, it is a big project but on Production level light it would take 10 mins to build. Now, after absolutely no change in the project when I build the lights it freezes right after the “Importance volume surface area calculated” in the swarm agent. Other projects build light just fine, this is the only one that freezes the computer.
By the look of it it seems some configuration that is somewhat off, but I have no idea what could possibly be.