Thanks for your Community post. I apologize that you are experiencing issues with your device powering off and turning back on randomly. This very well may be a result of a hardware issues. Which will be easily confirmed by taking your device into a Sprint S&R center. Do you currently carry TEP? If so, visit www.sprint.com/storelocator to locate your nearest store. Please keep us posted on the outcome of your store visit.
Sprint Social Care Team