Samsung Sii powering off after update to Android 4.0.4

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http://androidforums.com – Hi, My phone recently decided to automatically update android to 4.0.4 from 4.0.3. since the update it's been powering itself off regularly and refusing to turn back on even though when I have managed to get it back on it's shown plenty of power, like 60%. Does anyone know what's going on or what I should do? (General)