Don't know for sure if this helps for the Rivian (haven't tested it). But quit all instances of the Rivian app on your phone(s). That way no queries are sent to the truck and it should remain in sleep mode. I do know that helps with Tesla's. But like others have noticed there's a huge amount of data these trucks are sending back to the mothership on a daily basis. Not sure if there's a way to stop or slow that communication.