A similar thing has happened to me twice. The first time I noted IT I have no idea of the circumstances surrounding so just ignored. Last night driving home I was listening to an audiobook and haven't touched the phone for half an hour. Just at the climax (of course) of the book the playback stopped in mid sentence. When I looked at the phone there was nothing on iBooks. There were a number of titles with the cloud icon beside them. This time I do have screenshots etc
I've attempted to get all the support that they say 'Try again a few minutes'. The Apple status page says everything is green and asks if you have a problem that is not shown here "go to the service pages" which aren't working which makes it hard report them not working