Difficult coupling with the Wii U. Just go out

The coupling with the Wii U took many attempts as 3-10 per controller. When the original was more relaxed. But after all, they work (although I have not really used all the game).
Was strange that a controller has simply shut down while playing, at full battery indicator! The well lies not turning back readily, but eventually.
I think I have to do with the price but significant concessions in terms of quality. Let's see if this is true only for a controller. When I realize that and I get a complaint the other, I set the rating high.