I have found that when I subscribe to a podcast and select multiple episodes to download several of the episodes will stop downloading at a value less than 100%.
I then need to either restart Juice or do a check for new podcasts for these stalled downloads to restart.
Sometimes I have noticed that a new instance of the stalled podcast will appear in the downloads list once it resumes downloading.
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Please identify a specific feed (and episodes within it) where you regularly see this behavior.