It happens sporadically while playing the game.  I am always able to reload the most recent autosave and continue on passed the point where I crashed. 

The problem has decreased greatly since I switched from full screen mode to windowed and lowered the resolution.  In ~3 to ~4 hours playing today it has happened a few times.  Here are the crash logs for each time.  I'm uploading them all here because they are different crash logs for the same issue happening repeatedly.  

Here is the first crash:

Debug.err

Memory dump

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Here is the second:

Debug.err

Memory dump

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Here is the third:

Debug.err

Memory dump

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Here is the fourth:

Debug.err

Memory dump

Hope they help.  

On a side note, DropBox rocks.  Man does it make this easy.