Screen switches off when I dial and hit call button

When I select a contact from my list n hit call button or dial a number and hit call button the screen switches off even though the call is going on still. For example if I want to give a missed call it is not possible as the screen is going blank. Is there any setting for it?

Hi Myxperiaz3, welcome t the community!
I agree with @Quester. If you don't have a case or screen protector on the handset you could try clearing the cache or data for the Phone app by going into Settings > Apps > All > scroll down to Phone > tap Clear cache/data. (Try clearing cache first and if it doesn't work go back and tap clear data and test again). If this doesn't help then follow @Uliwoolys suggestion, here are additional steps on running the repair:
back up using PC Companion
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.
(Exactly what contents will be backed up may differ depending on phone model.
You can view detailed information about this as you follow the steps in the Backup & Restore wizard).
back up using Bridge for Mac
1. Launch Bridge For MAC.
2. Select "Back up your Xperia device".
3. Select the data you wish to back up from your device (the windows can be expanded for more detail as below; then select "Next".
4. The backup will now be in process, do not disconnect the phone while this runs.
Running the software repair on PC Companion:
1. Install and 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 Bridge for Mac:
1. Launch Bridge for MAC without the handset connected.
2. On the Main Window select "Xperia > Repair Xperia Device".
3. Ensure the phone is charged and select "Ok" in the following window.
4. Select Continue on the following page.
5. Wait until the initialising step is finished the continue as below.
6 . Select your model of phone from the list that appears
7. Follow the connection steps that appear, ensuring that you are holding the relevant button down before during and after the connection phase until the update/repair begins.
If this still doesn't resolve the issue then I would reccommend contacting your local Sony Xperia Customer Care team asap.

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Screen switches off when I dial and hit call button

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