I too have this problem with both 1.0.0 and 1.1.0. Removing FasterN9 cures the problem. When scrolling through settings pages it was constantly causing skipping in music, as did the waking the phone up. I didn't notice any other problems in my daily use and the phone UI was definitely smoother with FasterN9. (I suppose that the original cgrouping has more multitasking in mind.)