I have been using my alarm on my iPhone 4s with no problem until about a week ago. I always flip the phone to silent for the night, I am a light sleeper and have never had a problem with my alarm not working. Now when it feels like it no sound for alarm it just vibrates. Good thing I am a light sleeper and I happened to hear it vibrating on my nightstand. I have rebooted and all that good stuff. Any one have this problem and fix it? thanks in advance for your help!