Is it a premium 28mm speaker? They have been known to suddenly pack up.
If you try pressing the dome of the speaker does it make sound or feel like it's trying?
That would be my guess then. Same thing happened to mine. I replaced it with the bass speaker (IMO better).
Be aware though, the bass needs a slightly deeper fit. I've read of issues of it not fitting quite right within speaker holders. A little dremmel adjustment maybe required, as mine did.
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