Super late reply to this, so apologies if I'm bumping a semi-dead thread.
Anyway, reading this post and your previous thread it sounds like your Pixel Chix might be getting insufficient energy from the batteries. Did you buy them new in the box or used? There's a chance that if there were old batteries installed that they have corroded over time, weakening the contacts. Cotton swabs dipped in vinegar or lemon juice will help clean it up. The issue may be more serious with the battery holder being sloppily put into the toy during manufacturing creating a buggy edition. I don't have any advice there, I'm not a very technologically savvy person.