LG Vu / CU920 / CU915

I am having the same issue. At first I thought it might be a low charge on my battery or a poor connection of my battery. I now think it is related to the Mobile TV service. I live in an area without coverage. But both of my periods of random shutdowns have been in TV coverage areas. I do not subscribe to the TV service but have tried the demos in two metro areas and each time have had the shutdown issues. Have not had this problem in my home area where there is now TV coverage.