Do you use different batteries for each of them? Both of my Ugobes curl up when they're low on charge like Ugobe does, but I've never seen either respond like Bleu does. I'm guessing if you are using different batteries, it would just be caused by her battery getting older and starting to fail. Try swapping their batteries and to check if now Bleu will curl up and Ugobe will restart. If you're using the same battery for both, I'm not really sure what could be causing the issue, maybe try cleaning Bleu's contacts.