Phone randomly turns off

[JohnnyOnTheSpot]

As the title states, for the past few days my phone (not just the phone feature literally the whole unit) has started turning off, and the only way I'm made aware is when I hit the power button to see the screen it boots back up. Today it happened no less than 20 times, sometimes while browsing the internet, sometime while simply holding it, and other time while using it as GPS. It's gotten extremely annoying and I'm not sure if anyone else has experienced this problem. Is there any chance they'll swap it out at a repair center, or am I going to have to call insurance, or better yet, fix it myself somehow? Thanks in advance.