Im not sure if anyone else has had this problem but when i build walls that are rather large (4 or 5 walls long) my whole pc completely locks up and i have to restart my pc. It doesnt happen with any other game and it only happens in this game when i build walls. Not sure if it’s just my computer or something with the game so I wanted to post it. Thanks for taking the time to read this and this game is amazing!
Seems to be a memory bug when building, it is known and they are working on narrowing it down. How much RAM do you have?
As @KfrogCT says, what are your system specs?