rMBP random unexpected shutdown
I sent my laptop to two service centres and they said there is not any hardware issues. So I decided to clean install Mac OS X without installing any additional software but the problem still occurs.

Note: I also installed Windows 10 using bootcamp, the machine works without any unexpected shutdown issues.

I got this console log (http://pastebin.com/irLDsEhB), maybe these lines can help you identify this annoying issue.

Thanks