Samsung Galaxy S3 Randomly Shuts off by itself

I've had my phone since Nov. 2013 and it's been good to me. No water damage. Recently it started shutting down by itself. If I keep it charging it's fine. When I'm actively using my phone it's fine. Once I hit the lock screen button, it will still be on then in about 10 minutes when I go to check on my phone again, it's turned off. It's turning off by itselft. I have insurance on the phone but am wondering if there is any remedy before I resort to replacing my phone. I have pics/music/videos/contacts, I don't want to loose that stuff. I am not tech savvy so I don't know how to "back up" or save all my files before trying a factory reset to resolve the issue. Should I just go to my wireless provider for help before it turns off for good? Or are there any Android "tricks" that I can try to save my phone and all of its contents.

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