Several players in my realm including my son are having issues with their switch freezing since the update.
My son can barely get Minecraft to open without his switch freezing and needing a hard reset. When he does get it open, it freezes again at least half of the times he tries to sign into a realm.
Two other realm member who play on the switch are experiencing the same issue except neither one of them can open chat or anvils without the switch also freezing. The game is nearly unplayable on the nintendo switch.
Related issues
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if you wait 20 minutes without restarting it will say the software was closed because a communication error occurred.

Duplicate of MCPE-95621. Please search in the future if you haven't already.
A few times realms game play works, however, upon choosing the "Save and Quit" option and attempting to close the software from Switch home screen, the Switch locks up and requires a hard reset to power off and restart.