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Hi s-m
if it is a free apps, then try removing it and reinstall that, after removing all apps restart the phone then install the apps
>restore the phone to factory settings (you will be losing data on phone so better to keep back up)
Manjuboyz 
NOTE:
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Do you get a notification in the notification bar when this happens? If so, slide down the notification bar, tap and hold the notification and select app info to see which app it is.