my phone shut down alone

hi my phone shuts down, dont know exactly when becouse i hear the sms geting in but some times i dont open then, only after some times i get out the phone of my poket and it is off but i ever pas when its loket, never when i am using it. What can be the problem? should i reinstall it or can be fixed other way?

edit: sorry, i have a galaxy ace, cyanogenmod 7.2 kang by FrozenAceTeam

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