Inrepid shuts down randomly

[jp0213x]

I have been noticing lately that my Intrepid has been shutting off randomly. There has been times when I go lay my phone down and sometime when I come back to, the phone is off. I've been trying to find the cause of this problem but stumble across anything. The only program I have running on top of windows is the mobile shell app. I've been running this apps for a few months now with out any problems. Now when the phone powers off I have to pull the battery to get the phone back on. Has anyone run into the problem?