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Hi Husnain1996,
Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
Try putting the handset in Safemode and let us know if the issue continues.
Sorry to hear this but it sounds like a hardware issue so you would need to either return your device to the place of purchase or contact Xperia care http://www.sonymobile.com/global-en/support/contact-us/
it is possible that it could be software related. I suggest trying a software repair, however make sure to backup the device before doing so.
Here are the software repair instructions, if this does not help follow the instructions supplied above.
1. Before you start you have to download the PC Companion software from PC Companion
and install it on your PC.
2. Once installed on your PC, double-click the PC Companion icon on your desktop to start the update.
Note! For some models you will be prompted to do a backup prior to the update and then restore.
3. Install and open PC Companion then select Support Zone.
4. Phone Software Update.
5. Start.
6. Repair Phone
7. Continue
8. Accept data removal
9. Next
10. Wait for prepare
11. Select Phone
12. Follow the connection steps