From Release help:
CAMBRINTH (releases all active cambrinth links)

I swear this was working properly relatively recently.

Tonight when I tried it I got the following:
>get orb
You get a silver-dusted cambrinth orb etched with the image of a jet-black wolf calling out to its mate from inside your traveler's pack.
>invoke orb
The cambrinth orb pulses with Life energy. You reach for its center and forge a magical link to it, readying all of its mana for your use.
Roundtime: 1 sec.
>release cambrinth
Release what?
[Check RELEASE HELP for more information.]

I have to specify the individual cambrinth items or it won't recognize the command:
>release orb
You release your connection with a silver-dusted cambrinth orb etched with the image of a jet-black wolf calling out to its mate.