Having this problem too, did a factory reset and everything and nothing is downloading.
edit: just unchecked the download via wifi only option and the music is downloading..hope it doesn't eat into my data plan somehow
Has been happening to me the last couple of days as well. Audio stops after 15-20 minutes or so. About to install kitkat so hopefully that resolves the issue!
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Dunno but as a DNA owner, I wish I'd waited a few months for the HTC One..more storage and better speakers -_-
Plus I'd appreciate my Nexus 7 more if I had a phone with a smaller screen..lol.