Apple today released new tvOS 16.3.1 and HomePod 16.3.1 software updates, with the software coming two weeks after the tvOS 16.3 and HomePod 16.3 updates were released.
According to Apple’s release notes for HomePod software 16.3.1, the update includes general performance and stability improvements. Notes for tvOS 16.3.1 are unavailable as of yet, but are probably similar to the HomePod notes.
The tvOS 16.3.1 update can be downloaded over the air through the Settings app on the Apple TV by going to System > Software Update.