I have a Firestick and realized my Vizio was intermittently powering off and on when I was trying to control my television using the T.V.’s remote or buttons and not the firestick remote. I also tape off the I.R. sensor on the firestick remote or move it so the T.V.’s I.R. sensor doesn’t detect the remote. Problem solved. I don’t know if you’ve got a Firestick or not, but this is how I solved my issue.
I found the answer in this ifixit post: [post|508677]