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If phone is turned off and left overnight, or for a few hours, it won't turn back on even though the battery is fine. To power it back on I need to put it on charge - it then automatically reboots and will work OK.
I suggest that you backup your device data, then go thought the following clean application load process: http://bbry.lv/cKy9A0 Once the reload is complete, test to see if your device will turn back on after being left off. If the issue seems to be resolved, restore your data then test again.
