Support Htc sensation 4g keeps turning of randomly

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http://androidforums.com – My phone would randomly turn off, usually when i hang up the phone it would turn off, when taking a picture with the flash on, or surfing the internet. When it turns off this way the only way it will turn back on without it restarting before it gets to the home screen would be by charging it. When it is charging my phone would never restart or shut down. I still have software 1.50.531.1 don't want to upgrade to ice cream sandwich because i will not be able to use wifi hotspot. IDK WHAT TOO DO ANYMORE!! WHY DOES IT KEEP TURNING OFF AND WILL NOT TURN BACK ON UNLESS IM CHARGING IT?:mad::mad: (General)