[Q] Galaxy i9003 power off suddenly

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http://forum.xda-developers.com – I have Galaxy SL I9003. It is rooted Firmware Version : 2.3.6 Baseband Version : I9003DDLE1 Build Number : GINGERVREAD.DDLF2 from last few days I am facing a wiered problem that device shuts off suddenly while doing something and when I try to reboot it, it doesn't start like all battery has exhausted. It does not give any battery low message but just go off and I need to charge it again to start. I a not sure if this is the problem because of battery or device has some problem. I will try flashing it again and will see it solves the problem. In the meantime you suggestions are wel (HowTos)