Hi @Dt158, let me see if I can help out here!
Your post has been translated to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
Do you receive any kind of error message when you try to connect your headphones to the phone? Also, have you tried other headphones to see if the behaviour persists? You can also try cleaning the headset jack from any dirt or lint using for example a wooden or plastic toothpick.
Another thing you can try is to reboot your phone in safe mode to see if the headphone jack works better there. Safe mode is a troubleshooting mode where all downloaded apps are deactivated, thus you can see whether this behaviour is caused by a downloaded app or not. For more information on safe mode and how to use it, click here.
If the behaviour of the headphone jack persist in safe mode, you might need to repair the software on your phone using a computer and Xperia Companion. Keep in mind though that a software repair will erase all user data, so make sure to do a backup before the repair in order to prevent loss of data.
Try these measures and let me know how it goes!
