Brightness levels change while using Apple TV

The brightness levels change on my TV screen every few minutes while I'm watching my Apple TV. It happens with "Internet" sources (like Netflix and Vimeo) and "Computer" sources like iPhoto for sure. Maybe the other sources as well. Any clues?

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Check that the HDMI cable is correctly seated at both ends.
Try disconnecting the cable and connecting it again.
Try another HDMI cable.
Try the Apple TV with another TV

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