I have the exact same issue. Pandora will randomly stop playing music even though the progress bar is still scrolling along the bottom as if it was playing. Sometimes it works fine for hours, then skips frequently, other days it starts "going mute" right away. The only way for me to resolve it is to reload the page. I've tried using both Chrome and Firefox. Both browsers say they are current, with no updates to download. I shut down and reboot my computer typically every day.
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