While attempting to play Minecraft on Switch.  The official error code is "Cauldron".  I have turned the device on and off.  I have uninstalled Minecraft and reinstalled it, which resolves it until the Switch goes to sleep.

This has been a consistent issue since the release of 1.19.  it makes online play impossible and you can't access your akins or any packs.

Seems to work fine on Xbox and other systems so likely isolated to just the Switch.