Thanks for your message. This sounds like the field is losing focus or losing the connection to the router. But just so you know, I support US products and customers. And from what I can tell, this model is for Australia. (Correct me if I'm wrong.) So if you want the most accurate information, here's the Samsung Australia portal for support on that product: http://www.samsung.com/au/support/model/PS60E8000GMXXY
Hope this helps you!
I have a new Samsung PS60E8000 TV. The problem is an inability to put my password into the keyboard section of the network setup as the keyboard page disappears after I have typed in 2 letters. Sometimes the network setup disappears before I can make the router selection. Please HELP!!