Joy is short-lived

I bought 3 pieces of this model, as they are quite low in contrast to the original controller. After about 2 months, the first deficiency symptoms have begun. When one then was no longer the A Button. The next time the 2er Button stuck (stuck repeatedly and does not come out). In point 3, the shaking stopped going sometime. All were together at that following error, the Nunchuk also has fatal errors (unable to walk in a certain direction). I can not recommend it and am disappointed.