I just bought a new Wii Remote Plus. While I was playing New Super Mario Bros. Wii, sometimes Mario would do his little spin move while I wasn't even shaking the controller.
It's not a huge problem, but I don't want to end up running into an enemy because the controller misjudged what I was doing. The point is, can a Wii Remote Plus have a defective motion sensor?
I tried using my other Wii Remote Plus and it doesn't have the over-sensitive motion problem.