I assume you're not seeing any change in the volume bars? The fact that you can mute suggests that the button itself is working, so I'd try other mp3s, ideally ones that used to work (if you haven't already). The other question is whether the headphones work in other devices - possibly if they've failed your lisseuse is smart enough to notice and is trying to tell you (why it doesn't give you a full page error message I do not know)
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