I'm having issues with people in adjacent apartments to mine connecting to my LG 55LJ55 and casting apps (YouTube mainly). I live in a hotel-like apartment and use a communal WiFi network so this actually happens quite often. Have changed the TV's name to 'guaranteed virus' in a bid to curb this, but you'd be surprised that it still happens! Whilst I can stop apps from turning the TV on, I seem unable to limit who can connect to it when it is on. Any ideas???