I have the same problem but with arc on iPhone.
Posted a description here : https://community.roonlabs.com/t/arc-music-download-bug/220301
My downloads just stopped and there is no way I can restart them - tried restarting arc etc.
I also noticed weird things happening while downloading
- Arc displays 0 tracks of 3 downloaded, but the album I was trying to download has 4 tracks.
- During download, the blue color in progress circle is fluctuating back and forth (instead of staying still or going forward)
- Sone albums are marked as fully downloaded but in fact no tracks were downloaded.