I'm having an issue with Genius. Most of the time it's fine; I start playing a song, press the Genius button, and it queues up other songs that are similar. However, sometimes it'll actually stop playing the current song and put a different one at the top of the playlist. I don't mind a Genius that suggests more songs, but I don't want one that says "stop listening to that and listen to this instead". How do I make it always continue from the current song?