Track not belonging to selected playlist.

[jpsantosum]

Hi Spotify team,

Thanks for the continued great work you guys do everyday in bringing this amazing experience to your customers. I recently detected a bug, or an issue with the iphone mobile app. I like to listen to white noise while working, and sound of rain so I typically select a playlist called Rain Sounds. Recently while listening to it on my iphone, suddenly the music/track changes to Katy Perry or other random artist that does not belong to the Rain Sounds playlist. It's really weird, as I scroll through the playlist there aren't any other artists beyond "Rain Sounds", why would suddenly I'd be hearing to a random artist that is not in the playlist? It happen already a couple of times and it is anoying, maybe some bug...In any event great job guys, I can't go without spotify these days. 

Thanks,

-JP