Gotta love that @GooglePlayMusic just deleted all my downloaded music as I'm listening to it walking to work. Great service
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There's also been an issue with it trying to take my money for my subscription it's there but it isn't taking it.
If you haven't already, try signing out and signing back in to your account. If that doesn't work, you can reach out to our live support team here: http://yt.be/help/i16t . They'll also be able to help you out with your billing concern.