Blackberry Bold 9790 keeps turning itself off and back on?

AllisonTrochie

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My blackberry bold keeps turning itself off and back on for no reason. The battery will be fully charged and it does this over and over again until it kills the battery completely. The only time it doesn;t do this is if it is plugged in. I am wondering if it is the phone itself or the battery? If it is the battery, how much does it cost to replace it approximately?
 
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