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[Evil_Underlord]

Long time ago, I got the same issue. I was 100% sure, there was nothing hidden on the nas etc.
I also did several rescans, but it didn't fix it. Last resort was this:
sudo service mpd stop
sudo rm /var/lib/mpd/database
sudo service mpd start
mpc rescan

Since then, I haven't got any issue anymore. I suspect the mpd db was corrupt...

Thanks. Any advice on where/how to use this command?