Hi sonyZ3DF, welcome to the community!
You could try doing a software repair on your phone to see if that resolves the issue - otherwise perhaps take it back to the retailer who you purchased it from to see what assistance they can provide.
If you decide to try running a software repair, heres how you can do it:
Firstly you will need to download PC Companion or Bridge for Mac.
Backing up your handset using PC
1. Go to Support to install PC Companion on a Windows computer.
2. When installed, start PC Companion on the computer.
3. Connect your phone to the computer using a USB cable.
4. Click Start under Backup & Restore.
5. Follow the on-screen instructions.
Backing up on Bridge for Mac
1. Under Manage Media there should be an option that says back up your Xperia device, click here and the rest of the instructions will be on-screen.
Running the software repair on PC Companion
1. Open PC Companion then select Support Zone.
2. Phone Software Update.
3. Start.
4. Repair Phone
5. Continue
6. Accept data removal
7. Next
8. Wait for prepare
9. Select Phone
10. Follow the connection steps
Running the software repair on a Mac
1. Click Xperia at the top of the screen
2. Click Repair my Xperia Device
3. Follow the rest of the on-screen instructions
Hope this helps!
