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Hi abdelmogheeth,
Welcome to the community,
Are you able to advise what troubleshooting you have performed so far?
Try this step first.
Menu > Settings > Apps > All > Smart Connect > Clear Data
If this does not help, can you boot the device in to Safemode and test it and let us know the result?
In this case I can only really advise that you perform a backup of the device and then a software repair to reload the device. Try the instructions below.
This is done with either PC Companion or Bridge for Mac
Here's how to run the 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
And 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.