In zero’s case it’s his ears that grow.
The disk and memory capacity available to Totus has been exceeded. (That's why Totus was out of commission last week - they were doing an upgrade.) The only thing is - with more data to be processed, that will affect Joker response time. Expect many more "er's" and "uh's." (There are some laws that even Joker can't work his way around, like laws of physics for example.)