I went through all the suggested fixes my LG would allow.
1. Changed time and date to manual mode - this worked for maybe a day, then I got the “WiFi is turned off” message.
2. The “Turn off Quick Start” answer. That also worked for about a day, and then back to “WiFi is turned off” message. I could get it back after several plug/unplug cycles, but then it would be gone again the next day.
3. Change DNS to 8888 - my LG menu doesn’t have the option to edit Ethernet connection, apparently because I’m not connected with an Ethernet cable, since the router is in a room 50 feet away.
So, I finally took the ROKU route, and $40 solved the problem. I agree with the answer that said ROKU is smarter than any Smart TV. I’ve got great picture and sound.
Bought a LG 60 Inch 4K Ultra HD Smart TV 60UH8500 3D UHD TV a year and a half ago, and it's worked just fine 'til just a few weeks ago, when it started to lose the wifi connection, and when I'd go to turn it on again, there'd be a message saying that the wifi is turned off, and to turn it on. Occasionally it would come back on its own, and once in a while I'd see the screen where it's searching for available networks... and searching... and searching... This all seemed to happen after a recent update to the TV (though I'm not sure that'd be the reason). I've tried resetting my country and setting it back again, turning off "Quick Start," unplugging everything and plugging it all back in, and even had Spectrum come and give me a shiny new modem. Still nothing works. All other devices in my home find the network just fine. Any suggestions would be awesome. LG's support was really no help, as their suggestions were all things I'd already tried.