There have been several threads about this issue, which may be a a fatal flaw in LG Smart TVs. Here’s the rundown of solutions:
1. Unplug TV, wait 30 seconds and plug it back in. Go to Settings/Network and see if any WiFi networks are listed. Pick your home network and enter network password if necessary. If that doesn’t work.......
2. Go to Settings/General and select Time &Date - set it to manual. Turn TV off and back on. If you don’t get your WiFi back......
3 Go to Settings/General and select Quick Start - turn it off. Turn TV off and back on. If it’s still not working....
4. Purchase a ROKU for $40, it’s simple to set up and is simply better for making your TV able to stream effectively.
Each of the solutions 1-3 above worked temporarily on my TV, but after 2 weeks of fussing around with the LG system, I went the ROKU route, and never looked back.