Q: 2013 Retina MBP experiencing random restarts after installing El Capitan
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Oct 7, 2015 10:03 AMby norm123,HelpfulHey,
I understand that you are having issues with your MacBook Pro restarting at random times. I would start with taking a look at the article below to get you started with looking into the root cause. It will have you look at logs of what was going on at the the time of it restarting on you. It will also have you isolate by software and hardware. Be aware that this kind of troubleshooting will take some time. If you are still having issues, then you may need you contact Apple Support for further assistance.
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem."
https://support.apple.com/en-us/HT200553
Take care
