Hello and Welcome to FixYa!
I'll recommend you to update your phone's firmware. Its getting buggy.
To do so, you will need your USB data cable,
this application and a steady internet connection.
If you have the cable, download the application from the above link. Install and run it. Walk-through is pictorial and easy to follow. Will take half an hour.
Note: Backup the data before update, because it will bring your phone as out of the box condition.
If you have any Confusion, questions or issues regarding your problem do tell me.
Thank you for using FixYa!, Keep visiting..
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Concerned, Nooh: FixYa Team.