Our TV is stupid. :-)
Been there. We have antenna TV, but its nice to stream video files from inside my house. I just want to block the outside world from this set.
I got suspicious as I was just watching antenna TV today and it cut in and out and went black. It turned out to be my internet router having a fit at that same time.\
My immediate solution was to turn off the wi-fi setting in the tv. The TV thinks is has no connection now.