So, we walk warranty and we called the mattel customer service. They exchanged and we received a new mobile magic leaves. And there, no luck, nothing doing, the mobile again refused to shoot as soon as you pressed the screws. This time, we had no engine noise, but the motive remained fixed. Clearly a problem of false contact between the plastic parts. Finally, we recalled the mattel customer service that has made us an exchange against other items.
Honestly, I think the product is not designed very well, certainly he settled well in bed is nice and with beautiful colors, but the motive is really heavy and this was why it requires a good engine (which is sometimes noisy). Moreover, much of the mechanics is made with plastic parts, which certainly explains that the mechanism is very fragile ... Disappointing for a model of this price!