I've had my Optimus S about a week or so. I plugged it into the factory charger last night and set the alarm on it like I've been doing since I got it. I woke up 30 minutes late today because the alarm didn't go off. Pick up the phone and the phone is off. I was able to just power it up with the power button. I read on the Sprint Forums where a few others have had this happen, but they had to do a battery pull to turn it back on. Has anyone experienced this? Any ideas what would cause it, software, hardware problem?