play.itunes.apple.com/

We run a radio station streaming app in IOS which has suddenly stopped working.

When a radio stream is selected the player opens and plays for a couple of seconds and then crashes, it has been working without problems for a long time up until last week when this began to happen.

When the player opens it makes three calls.

One to api2.testfairly.com

One to the media stream url

and one to play.itunes.apple.com

It seems to be the last call that fails. Can anyone tell me if there have been any changes relating to that last call at the I tunes end or any other reason it might be failing?