I don't know why my retina MacbookPro keeps crashing and how to fix
This is a Diagnostic not a repair

Following might show what is making it crush.

Copy/Paste the following in to your Terminal (located in the utility folder).

syslog -k Sender kernel -k Message CSeq 'n Cause: -' | tail | awk '/:/{$4=""; print}' | pbcopy


The output will be copied to your clip board.