I noticed that a calendar alert that I setup did not play the sound I had chosen. I checked it out and all ring tones and alert sounds would not play. I witnessed this by going in an attempting selecting others, and none would sound. I rebooted and all was well. I'm wondering if this is a bug that others have experienced. Hopefully this is one time event, as alerts are important to me. Just me or is this a bug that has happened to you?