Playlist dissapear using multiple devices

[thocar]

I just upgraded to the premium version and installed Spotify on the following devices in addition to the 2 computers on which I have Spotify running on : Ipod Touch, Blackberry and Asus Eeepad (Android)

Then, every time I launch Spotify on the Blackberry  playlists dissapear. To avoid that in the end all my playlists are gone, I uninstalled Spotify on the Blackberry and on the Eeepad, Sinc then everything is stable again.

Is this a bug with the Blackberry application?

Is this a bug when using too many devices?

Why isn't there a function to save (or backup) a playlist?

Thanks