https://wccftech.com/nintendo-switch-system-update-9-1-0/

Nintendo has rolled out Nintendo Switch System Update 9.1.0 which improves the platform’s general stability and addresses a color animation issue when attaching the Joy-Con controller.

Just like new firmware update for Sony’s PlayStation 4, a new system update for Nintendo’s hybrid platform means more stability. Almost all previous firmware updates for the Switch have improved general system stability and this is also the case with the 9.1.0 update.