Hey Nellytambwe,
Welcome to the BlackBerry® Support Community Forums.
I would suggest to do a clean reload of the BlackBerry® device software as shown here: http://btsc.webapps.blackberry.com/btsc/KB11320, please test before restoring any data to the device.
If this resolves the issue do a selective restore of essential data (Address Book, Calendar, Task, Memos, BBM contacts etc.)
How to use BlackBerry Desktop Software to restore data to a BlackBerry smartphone from a backup file
http://btsc.webapps.blackberry.com/btsc/KB10339
If the issue still persists after the reload, further investigation might be required. To help further diagnose the cause, contact your wireless service provider or BlackBerry® Technical Support Services for further review and support.
Thank you
-HB
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