I have a Sony TV using the same wifi, and netflix has never had a problem maintaining a constant stream, on that TV.
Sitting just below the TV I have a samsung BD player with smart tv media player, running the Lightbox app, which I have to say is far inferior to netflix, and is becoming too painful to use with the constant dropping out.
Sitting there watching a show, I have a wifi signal strength app on my phone, and the phone shows a mostly constant wifi signal, also the phone doesn't lose its wifi connection, so given that the wifi to phone and Sony TV are not faulty, this leaves either the Samsung BD player or the Lightbox app giving me grief.
Does the app make any attempt to reconnect the wifi if the connection was dropped for a tiny fraction of time?
Also, would be great if the app handled tracking of where I had got to in a show instead of instantly offering up the next episode. Remembering the point it is at when the loss of internet event occurs would be a really neat feature.