They reshuffle your liked songs and playlists at random... You put your music on pause to use the bathroom and come back to a totally different order. It completely messes up the flow of songs and basically makes playlists irrelevant. I understand that the folks at Spotify need to come up with "cool" ways to make their app interesting, but this ain't it. It basically shouts out that none of the people working at Spotify actually listen to music or care for any variety/creativity.