Apple has released an update for tvOS bringing it to version 16.3.3, with the release fixing a problem affecting the third-generation Apple TV 4K.
The update can be downloaded to the Apple TV as an over-the-air installation, performed via the Settings app on the Apple TV under System, then selecting Software Update. It can also be installed automatically, if that feature is enabled in tvOS.
Apple's notes for the tvOS 16.3.3 update states it "fixes an issue were the Siri Remote can become unresponsive on Apple TV 4K (3rd generation)." While Apple doesn't mention it, there is also a strong possibility that Apple also included its customary performance and stability improvements.