Reply to Freezing Issues with Traktor

I just got a Macbook pro retina display 2.4 GHz i5 8GB.
I downloaded Traktor Pro and before my gig on boxing day give it a try.
My S4 turned off on its own and the program froze my computer (no mouse movement, nothing), I restarted it again and had no issue. I played my gig no issues.
This morning while practicing it did the same thing twice. The S4 will shut off then the program freezes....
Any insight would be great, I would hate for this to happen during a gig.