I am sorry to hear about the problems with your phone. If you haven't already tried it, go ahead and remove the battery from the phone while it is still on. If that doesn't get it, I hate to say it, but there might be a hardware issue on the phone that would need to be addressed by a Sprint Service and Repair Center.
If it does come down to that, you can locate the closest one to you by going to www.sprint.com/storelocator and selecting "Repair Centers near me", and punching in your location.
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