I've had the G3 for a week now, I'm in Argentina but it was brought from the U.S., made in Korea.
I got it, had it one day and everything was okay. Then I installed PC Suite to make a full backup of it with the brand new soft in case i ever have to restore it, with all the apps installed, and got a pop up saying there was a firmware update. v10e. I did it, and that's when I started to have the shutdowns. I don't have to pull the battery, just turn it on. It also happens during the night, every day, only once per day. Very strange.
I read someone posted that LG would launch an update in a few days to solve this. I'll check again everyday..
I'm very upset I wish I'd seen this before buying it
I'll try today going back to the backup I did before installing the firmware update to see if it stops doing this