From another thread:
JoelFB:
# STEAM CRASH / GAME FREEZE We are aware of the game crash/freeze that also affects your Steam client, we're looking into it! In the interim, it might be worth to do the following:
Starbase game settings:
* Use low settings & use Windowed mode
Steam settings:
* Steam -> Settings -> In-Game -> Disable "Enable the Steam Overlay while in-game" (Multiple reports of helping)
* Steam -> Settings -> In-Game -> Steam Networking, change Default to Never (Multiple reports of helping)
More experimental/advanced:
* Set "High Priority" for the starbase.exe task in Task Manager -> Details and find starbase.exe, right-click, and "Set Priority" to High
People have reported less crashes with these settings.
Update 16:40 UTC: This problem is related to the Steam client; we are talking to Steam and are working with them towards a hotfix (which probably will take some time given the nature of the problem). We'll provide updates here as we get more information.
Pasted from Discord #Known-issues, I hope that this helps.