I just had the same thing happen to me today. I was headed to church and I was playing my phone through my car like normal. My phone was fully charged and it's not rooted or anything. Then all of a sudden my phone started rebooting on it's own. Then it just stopped and nothing after that. So after church I went to Verizon to have it looked at. The lady asked me had I dropped the phone because she claims there is a crack on my screen protector. I told her that I had not dropped it and that I was currently using it when everything went crazy. She, somehow, got the phone to turn on (1) time and the screen was scrambled. She says it looks like my screen was cracked but I know that I hadn't dropped my phone.
They are sending off for a new phone but she tells me that if I send them my current phone and they find a crack in the back of the screen that they are going to charge me full price for the replacement phone, which is some bull. So, I'm paying monthly payments to verizon all ready and they are telling me that I am going to have to pay LG for a full phone too? BULL!!!!