Hi all, '''I have a solution'''.[br]
I too had intermittent headphone sound and tried all the tips and tricks suggested here including updating the X Box One wireless controllers.[br]
No matter what I did, there was no sound in the headphones, so I used the same technique as you do with all sound devices on computers, I triggered it![br]
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How to do this:[br]
When you enter a game with headphones attached to the controller and there’s no sound…[br]
'''Press the Big X''' on your controller '''once lightly''', to enter the menu.[br]
Below “Settings”, you’ll see “'''Audio'''”, click this and you’ll see '''3 slider controls'''.[br]
Go down to the '''middle slider''' and '''slide it down a notch'''.[br]
You should '''instantly hear sound''' or game music in your headphones.[br]
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This will have triggered the sound card to work correctly![br]
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It may not stay working forever and so may need triggering periodically or every time you start up your X Box and want to use a headset.