I just got a new computer and FAF keeps crashing in some private games I'm running to make my templates for each faction. This is in sandbox mode with no mods running . It's happened to me as both Cybran and Aeon so far. I've also tried different maps to test out if it's just one map, but it doesn't appear to be. I've added the log files for two different occurrences if that helps.
So far I haven't noticed a particular action that triggers the crash. You'll see that one of those games was able to go well over an hour before crashing. The other was less than 30min. Let me know if more info is needed.