"Another VIZIO turns off randomly"에 답변My thanks to everyone who posted above. I've had my Visio for about 8 years, use it every day, and never had the power problem until the past few months. I suspected it had something to do with the fact that I'd cut the cord on cable about a year ago. When we were on Comcast cable it never happened, but now I'm using Roku. My other set (a Panasonic) is also on a Roku and it's fine, no problems. So, based on the advice in several posts, I: (1) Unplugged everything, and pulled the Roku out of the HDMI port. (2) Plugged the Visio back in, then did the factory rest (picked Menu on the remote, System 》Reset&Admin, then skipped all steps that involved connecting the tv to a network) (3) Plugged the Roku power back in on the same extension cord (limited outlets available) and then plugged it into the HDMI port (4) Used the Visio remote to select the Roku as Input It's now been running for several hours with no shutdown! YEAH!