Add me to the list too. The battery was good. I was just walking, my watch vibrated, I looked down, and the screen never lit up. It wouldnt turn back on. Later that night from the charger, it said something like, "I didn't understand" and I realised it was listening, so I started messing with it and got it to light up again. If it does it again, I'll take it back to Best Buy. I've only had it 2 wks and I did purchase the Best Buy 2 yr insurance.
Just had the very same thing happen; had the watch seven days, worked great until the sixth day, when the battery, which was 100 percent charged, died in several hours. Put the watch on the charger until 100 percent charged, and then it wouldnt turn on, no matter how many buttons I pressed and held. Returned it and got another, and hope it doesnt happen again!