Turning off the device

I am having some problem with z10 when I am opening any applications it is not loading properly so I have done factory reset by giving the wrong password for 10 times (because even the setting is not opening)...after that the device was reset to factory reset and then I connected my z10 to my laptop, to install the os.(10.2.1.2977 ). so I installed it,it turned on successfully......but after 5 hours......my device is turning off by a pop up(turning off the device)at least 3 to 4 times a day.....and every time I need to connect to my charger to turn it on again....... how to solve this problem .....plz help me.......

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