I downloaded quite a few songs on my phone. today, at turn on my mobile, half of the songs appeared as "ready to download" songs I had already downloaded like it was erased. Is it a bug? It bothers me as they are about 500 songs I downloaded from my mobile network and i do not accept the simple answer that " have been erased." all my applications and files are there, as if nothing had happened. So sad that Spotify has no customer service being a service we paid.