07-06-2013 07:32 AM
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Have you recently installed any application before this Problem started ? Think carefully !
If you have then try to boot your device on Safe Mode , On Safe Mode delete any application which you think might be responsible for this issue , from Options > Device > Application Manegement > locate and delete any newly installed 3rd party application , it might help in resolving your issue :
KB17877 : How to start a BlackBerry smartphone in Safe Mode
KB10040 : How to view or remove installed application on a blackberry smartphone
Try it and let us know.