Today spotify on my iPhone would not connect, for whatever reason. No big deal, I thought. I'll play the albums I've saved offline. I tried to open those albums, however, and was presented with a loading screen. The offline albums would not open. I tried opening and closing spotify. I tried switching to offline mode. Nothing. Once I got home, connected to wifi and signed in, I could then open the albums.

What is the point of having offline files if I can't access those files when something goes wrong with my connection?

Edit: Just tested out a few things:

I opened an offline album on wifi, and then switched back to 3G. Spotify again couldn't connect. I went to offline album and it opened. Fine. Then I went to another offline album. It wouldn't open. Am I missing something here? Are offline files only available offline when they've been recently cached?