Samsung s4 shuts off by itself topic

Alright so recently out of the blues whenever I go on Google Maps or browse the internet on the S4. It turns off by itself, I try it again and it does it again. Not sure exactly why but I'm looking for an explanation of some sort, or if some one else is facing the same issue. It would be kindly appreciated if any one could enlighten me to as what I should do to solve such an issue.

Thanks for taking the time :)