Same issue here. Try updating the firmware, but don't trust your tv if it tells you the firmware is already up-to-date. In that case use a usb stick and update manually. Worked for me.
NetFlix Error UI-800-2 is the most common error on smart TV. If you also one of the victim of this erorr kindly follow the steps mentioned below :
Restart Your Wi-Fi
Restart Setup Box Or Streaming Media Player
Sign out – Sign In Netflix
For Full Article Please Visit : How To Fix Netflix Error UI-800-2
I couldn't believe it and thought you were making a a joke about a Konami code.
It worked!! It brings up the configuration page and let's you hot "reset" or something. Thank you so much.