Hello everyone! We are working on getting a stable hotfix for the temperature/crash issues people have been experiencing since the release of the Cosmic Upgrade. If you would like to give it a try, you can try it by switching to the cosmic_upgrade_hotfix branch. The branch has some fixes for some timing issues happening between the game and the simulation and it also has a fix wallpaper deconstruction not opening holes into space.
You can join in the Discussion Topic here.
If you run into a bug, please visit the Klei Bug Tracker.