I have a similar problem with the Internet connection of my LC Smart TV. It can’t find the Internet and tells me a need to restart my router. Every other device in the house sees the Internet just fine, including several computers. Restarting the router works, but that’s a pain to do, as it means those other computers are temporarily off line. So i can’t do it if my daughter is watching videos with a friend on her laptop, or my husband is in a teleconference at work. But that means i can be frustrated about not being able to watch the things i wanted to watch while i hit the treadmill for a couple of hours.
It’s not an every day problem, but it has happened several times since i set up the TV a few months ago.