I've also been having this issue,  game play is grindingly slow when placing items, then randomly crashes the pc. No pattern to it that I can see, doing random things at any given crash.
This is all in sandbox mode - my pc should be able to cope with this game, it did fine before the Fantasy DLC was installed. I've got a few Workshop items which again worked fine before DLC, could these be causing the issues?

​Hello, 

Sorry to hear this! 

So that I can try to investigate your issue further, would you mind sending across your Two Point Museum (TPM) folder and a DxDiag?

To find your TPM folder,  follow this navigation path in file explorer: C:\Users\<username>\AppData\LocalLow\Two Point Studios\Two Point Museum. Once located, "Zip" the folder up (right click and you should see the option), then attach it to your bug report/reply. Please let us know which save slot to look in too if that’s where your issue occurs! 

Zipping a folder is a way of compressing it into a smaller size. If you don't have an option to do this, you may need to download a program to help. I use one called 7zip which can be obtained here. The top option - ".exe - 64bit windows..." should do the trick. 

Thanks,

Chizel

I would love to give you a save file but I am an Xbox one x player. After a bit of gameplay, the museum goes "black" some items have color but walls and floors become black. Shortly after, I get a crash back to the Xbox dashboard. Sometimes I crash without the "black bug". Also, as other have stated, the showcase is bugged.  I am no longer getting offers to host a showcase exhibit. I may never get the shiny stickers because of this.