Hi all.
I posted it above, but decided to do it again because this problem was so annoying. I was really frustrated.
I tried out so many solutions that I found here and other sites that I started to get confused of what was really done, because sometimes a setting would make the headset work, but then the problem started again soon later.
What solved was the proposal of robertstone88 above. There is a problem in the audio P2 jack. The contacts are not well assembled or something. I took my controller to someone that fixes it and asked just to do what is said “gently bend the pins out to make more of a contact". It has been working since then. Two months so far and no problem at all.
Hope it helps.