Same problem here, Pnoelle. When did you purchase those tracks?
When I play the latest 38 tracks I purchased from Beatport a few days ago they cause random lock-ups of the music app which kicks me back to the playlist showing all of the tracks.😠 If I then play the song which locked-up the app it will usually play fine, but sometimes it locks up again. 😢
I think there's something wrong with their newest encoded MP3s since the other 1000+ tracks from Beatport that I have on my phone do not have this problem. I don't know how, but maybe this has something to do with the new AIFF format they introduced?
I use an iPhone 5 running iOS 6.1.4. Load the songs to the phone from a Mac iTunes 11.0.2.