Frequent Crashes with Blueprints

[ChaosNe0]

Please excuse the generic title, but I don't know what to look out for to be more precise.
I play with two other players on a locally hosted, non-dedicated server. Satisfactory crashes for one player all the time. That could just be their computer or whatever, but now it's happening to me - and therefore the server - too.
We haven't build any mega structures and are - in my opinion - very modest with our production lines.

The problem I want to address is: Sometimes, when I want to build from a blueprint inside the blueprint-designer, the game crashes. After the restart it works fine again, until it doesn't less than half an hour later.
I attempted to solve this by verifying my game files, but this apparently hasn't worked.

Does anyone here have any idea on what I could try? What are known bugs I should look out for? Is there something I should look for in the error report? Is this verified to be solved when the game comes out?

Thank you for helping! It's much appreciated!

Edit:
One player just tried to build a single wall with door and the game crashed again. Is there an upper limit to how many items there can be in the world?
The error message traces the crashes back to something with Unreal Engine, so maybe that helps.