I've got random crashes now. I've been playing the game since I bought it on Steam around Xmas time, but only yesterday started to have crashes. Not sure what's up. It's definitely reproducible, since if I reload the same savegame/auto-save, it crashes after a minute or two consistently. If I reload an earlier autosave, it usually fixes it until a couple hours later. I'm not sure if I need to do some specific behaviour, like always trying to build a water pump or ventilation pump, since when I reload, I usually am trying to re-do the progress I lost when I crashed.
Ubuntu Linux, crash log attached, savegame attached.