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I think that I might have an idea, but do not quote me on this one. You will need Barry to advise you more.
However, it might be where Person A has put on music and then Person B comes along and want to play something that is not in your library so it starts downloading.
I would turn off the youtube downloader in the settings and see if this stops it.
If it does not then obviously this is not the problem, but it might be.
Regards
Mark