This is weird. We have had a Wii for a year with three remotes. Yesterday, one of the remotes started acting strange. Anytime it moves up, the icon (arrow) on the screen moves down. If you move the remote down, the icon goes up. Movement left and the arrow moves right. Move right and the icon moves left.
Basically, it moves the OPPOSITE direction from what it should do.
I have replaced the batteries and re-synched the remote but it did not help. The other two remotes we have work fine.