Allows you to "cast" YouTube from your phone or use the dedicated remote.
If your TV's date/time is wrong, Google’s security certificates will fail, causing YouTube to crash.
Sometimes a clean slate allows a sideloaded app to run more smoothly.
Sometimes, specific older versions of the official app (like version 2.02.08) still communicate with the servers better than the one pre-installed on your TV. Visit a reputable site like . Search for "YouTube for Android TV (Android 4.4+)".