Motorola Photon 4G :: 10 Minutes Later Go To Use The Phone And It Was Off?

I contacted technical support and they said that it was new and needed to charge overnight. So it charged overnight and it continued to shut down several times that day. It did it a few times on the morning of the 18th so I took it to the Sprint Store. They said it was a simple fix and that the SIM was causing the problem. They took the SIM out and restarted the phone and voila- right? WRONG, 10 minutes later I go to use the phone and it was off AGAIN. I took it right back to the store and they said that they forgot to do a factory reset without the SIM in the phone. So the did the reset. I refused to leave the parking lot until I knew it would not shut off. Like clockwork, within 15 minutes it was off again.

I demanded a swap and they gave me a different PHOTON. It was great for about 24 hours and today restarted by itself once and then a few minutes later just shut down again. I called Sprint and the rep actually told me to try putting a piece of folded paper between the battery and the back plate!!! I just paid a load for this phone and I shouldn't have to rig it with folded paper. What is the deal with these phones? Are they all like this or are there some that are actually functioning properly? Is there a specific lot number or part that causes it?