If you experience the error code UI-120, it typically points to a communication issue between your device and the Netflix app. Follow the troubleshooting steps for your device below to resolve the issue.
From the Netflix Home screen, open the menu on the left.
Select Get Help or Settings.
Select Sign out.
If you're on an error screen:
Select More Details.
Select Sign out or Reset.
If you can't find Sign out, press these buttons in order on your remote: Up, Up, Down, Down, Left, Right, Left, Right, Up, Up, Up, Up. Then, select Sign out, Reset, or Deactivate.
Unplug your device from power.
Press the power button on the device once, then wait 1 minute. If your device doesn't have a power button or you can't reach it, leave it unplugged for 3 minutes instead.
Plug your device back in.
Turn your device on and try Netflix again.
Your device is having a hardware or software problem that only the manufacturer can solve.
Contact the device manufacturer and ask for help:
Updating to the latest firmware for the device.
Performing a factory reset.
If the manufacturer can't help, try watching Netflix on a different device.