I solved this by adding a timestamp at the end of the mp3 url to load the page. This forced a new load of content each time and fixed a cache error.
This seems more like a job than a fix. I still don’t know the root cause of the problem, but if you have a similar problem, and you just need to move on, add a timestamp or random number as a parameter at the end of the URL
.../assets/music/walden.mp3?[timestamp]
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