Remote won’t stay connected
The Apple TV remote won’t stay connectecd
Apple TV 4K, tvOS 12
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The Apple TV remote won’t stay connected
If your Siri Remote or Apple TV Remote isn't working - Apple Support
This support document has the recommended procedures: (1) restart the remote, and (2) pair the remote again. Also check the battery charge level.
And lastly: “If you still need help, contact Apple Support.”
Apple TV 4K, tvOS 12
Users are advised to keep their devices up-to-date, for best support, features, and stability. We’re on tvOS 16.2 now.
Update your Apple TV - Apple Support
About Apple TV 4K and Apple TV HD software updates - Apple Support