Can't sync music to offline playlists

[Serious_Bacon]

Okay, so a few weeks ago I could sync music for offline use in my playlists fine, but it just suddenly stopped letting me. It shows the loading spin thing like it is downloading then just stops and won't download. Usually when it's downloading, and I stream the music it will automatically save it for online, it dosnt do that. I can stream music fine though.
Would appreciate any help. And I have enough space on my iPod. I have about 700 mb left.

[Serious_Bacon]

I should say I can't save music instead of syncing it.

[Peter__]

Spotify tends to stop syncing when free space falls below 1GB. Try freeing up some space.