Hi @k3dz10r, let me see if I can help out here!
Have you been able to carry out a quick test of the speakers in order to see if the hardware works as intended? Find and tap Settings > Support > Xperia Tests > Speakers & microphone.
Another thing that you can try is to reboot your phone in safe mode to see if the earspeaker behaves the same way there. All apps downloaded from Play Store is temporarily deactivated while in safe mode and that way, you can see if this behaviour is caused by a downloaded app. For more information on safe mode and how to use it, click here.
If the speaker behaves the same way in safe mode, I would suggest that you try to repair the software using a computer and Xperia Companion. Keep in mind though that a software repair will erase all user data from the phone, so make sure to do a backup of your user data before the repair.
If none of these measures manages to improve the functionality of the ear speaker, I believe that the best thing to do is to get in contact with your local support team in order to have the phone sent to an authorized service center. If you have any questions regarding the service such as service routines, warranty and consumer laws, these kind of questions are best answered by your local support team as well.
Try these measures and let me know how it goes!
