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After long baking light Unreal crash

Hi, I’ve got problem with baking static lights. I’ve import model with Datasmith and set maps min and max resolution from 64. So pretty low.
When I start building light it takes abput 1 hour. The model has something abput 1mln verts so it’s not very heavy.
When the light is build in 100% then Unreal does “Importing built static lighting”. And somewhere about 43% who;e system is crashing.

I’ve seen system monitor and noticed that building light takes about 86% of memory (32GB). But when it gets for importing this static light it goes for 100%.

For testing I’ve done the same in Unity. With no problems. Generating UV’s was about 3 minutes and baking took 30 minutes.
Aby suggestions what can be wrong?