I bought a Vizio TV about two years ago and returned it within 24 hours for a similar problem. After some research I discovered Vizio TVs do not work on a network with file sharing enabled. The network connection will not work or will drop frequently. I tested turning file sharing on and off on my network and the TV would work or fail based on the settings.
Vizio's only solution at that time was to turn off file sharing on the network, something I was not willing to do to make the TV work. It would be too inconvenient for my computers.
I don't know if Vizio has corrected the problem but if they haven't it will never work properly if you have file sharing enabled on your hoe netowrk.
Search Google for Vizio and File Sharing for more info and File Sharing and your computer operating system if you want to test turning file sharing off.
