I called Vizio for the same problem. They had me do a hard reset which made me lose all my apps and settings just to find out that doesn't fix it. Then they wanted me to reinstall my drivers on my PC which I had already tried. Then they verified my phone number, gave me a case number, and said they would get with their tech programmers and get an answer for this. "I will call you back with it when we get it solved."
That was two days ago and nothing. I am not holding my breath, but if I get a fix I will post it.