Headphones purchased from Sony, type wh 1000 mx3. ...

Headphones purchased from Sony, type wh 1000 mx3. After 3 months the right earcup did not work properly. They contacted and sent. After a week returned with the text that it was repaired.
The same problem after 3 days. This time I went to an Electrician. This has opened it and soldered a wire to the speaker. So this was the problem. Sony didn't do anything about it the first time.