Hmmm first I've heard of it, but I usually leave flip running in Insomanic mode since I fixed that brightness level thing. So just to be clear, at alarm time flip opens, the sound plays and alarm buttons show up... you hit snooze and it goes quiet, back to normal clock mode... then in say 5 minutes (or whatever your snooze time was), the alarm buttons pop back up but no sound is heard? It sounds like there's something else preventing the sound from working... are there any other apps running at the time in the background?