The Netflix error code UI-800-16 often occurs due to issues with the app's data or network connectivity. To resolve this, start by restarting the device and reinstalling Netflix. Clearing the app cache or data might help by eliminating corrupted files causing the error. Ensure the device's firmware is updated and check for any pending updates for the Netflix app itself. Verifying the network connection or switching to a different network can also troubleshoot this error. Sometimes, signing out and back into Netflix can refresh the app's settings, resolving the UI-800-16 error and restoring seamless streaming on your device.