track unavailable

[gawwdawful]

Why would some of my songs become unavailabe on on my iphone, while here I am listening to them on spotify through the desktop client?

As an example, I have been listening to Aimee Mann's "Video" and "Guys Like Me" for a week or so on the iphone flawlessly. Then, today, the songs are grayed out and I get the message "Track Unavailabe. . ..try radio."  Blah Blah.

However, here I am on the desktop listening to the spotify songs no problem through Windows.

WTF. Glad I pay for premium. Any iphone users out there with any ideas - I'd love some help.  

I have done a power off, log off, fresh install of spotify, etc. Most of my songs are still there and working, but why would some songs be suddenly greyed just on the iphone and not on the desktop client?

[duncanreid-us]

Yes, I've had the same or similar problem.  Occasionally tracks I've added to play lists and played successfully often suddenly and apparently randomly are greyed out while other songs by the same artist and the same album remain.  anyone know how to correct that?