Audible books no sound through headphone

I was listening to a book on the phone ans suddenly the sound stopped. The book was still playing. I have sound when i remove the headphones and use the speaker. I can also hear the "clicks" that audible makes when i press something, so there is sound through the headphone, but not the actual book. I have tried restarting the app, the phone and even reinstalled the app. Still an not book through the headpone.
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