Why does TV audio continue playing when opening YouTube or switching to HDMI after restarting the TV?

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If you open YouTube or switch to an HDMI input too soon after restarting the TV, audio from the previously viewed TV channel may continue playing in the background.

To help prevent this:

1. Turn the TV off and back on again.
2. Wait until the Home screen is fully displayed.
3. Only then:
   • Open YouTube using the YouTube button or from the Home menu,
     or
   • Open the HDMI input using the Smart Input button or from the Home menu.