I've had this happen on two different iPhones (5 and 5S) and iPad Mini Retina today. I'll be playing a song and it will randomly skip to another song. As if someone else is playing my playlist and changing the song. Then I was playing on a Bluetooth speaker and it would stop playing the audio but the seek-bar was still going. I thought it was an issue with the Bluetooth, but now I was playing music from a different iPhone on an airplay speaker and just had the same thing happen.
Hi! All three devices are updated to the latest iOS 7.1. All devices were using WiFi with a 50Mb/s connection over 802.11ac. This was all while playing one of my playlists (starred) that is not saved locally, so it is streaming.