Samsung 3 clock/alarm question

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http://androidforums.com – I am a new droid user. My Samsung 3 came with a clock application that I have been trying to use as an alarm clock. I have found on at least two occasions that the alarm will go off on the screen but no sound. I have rebooted the droid and set a new alarm and then it will work. I have checked the settings for the application and the sound is on full volume. I have missed two wakeups because of this...please help. I also noticed when I first loaded flashlight it would make a Star Wars like sound when activated but that no longer works. While that feature is cool...not sure if they two are rela (General)