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Try settings-apps-all,scroll down to smart connect. Force stop and clear data. Restart.
Can you try to remove the headset while listening to music or while in a call? Do that several times.
Hi WinniethePooh, welcome to the community!
Before contacting Sony Xperia Care in your region, you could try running a software repair on your handset first. You just need access to a computer with an internet connection, if you do then download either PC Companion or Bridge for Mac. Note: a software repair will delete all user data however you can do a backup & restore the data back to the phone after the repair. To do a backup on PC Companion just click Start under Backup & Restore - the rest of the instructions should be on screen. On a Mac, just click Back up my Xperia Device on the main page of Bridge for Mac.
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.
I hope this resolves the issue for you, if it doesn't then follow Phy's advice & contact Sony Xperia Customer Care in your region (you can click the link in my signature to find contact details).