Rimworld locks up

[Yankton]

Rimworld locks up after a minute or so.  Have to Ctrl+alt+del to get the task manager and close it, can't alt+tab out.  Running Windows 7, 64-bit.  Output_log is attached but not zipped (compression made almost no size difference so didn't bother).  If I can supply any other data to help isolate the issue please just ask.  This is the latest version of Rimworld.  I think this was about 40 days (game time) in when it started to happen.  Relaunch and reload and it goes for about another minute or so before locking up again.  Had to trim the output log down so it would fit. 



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