I know they mentioned interference from sunlight before (and its in the manual), but it had totally slipped my mind.
It's a pretty bright day out (compounded by the reflected light off all the snow in the back yard), and even with the curtains closed there's a fair amount of sunlight coming into the back room where my Wii is. And for the first time, I see what they mean.
Even less than 5 feet from the TV, the Wiimote is absolutely flakey... I was attempting to play Dragonball Z, but the reticule keeps jerking around all crazy (and for someone with an inherited essential tremor condition, that's saying a lot). When the sun briefly went behind the clouds the Wiimote went back to functioning perfectly. With the sun out a "move closer to your TV" message kept appearing on the screen, so even though DBZ's reticule isn't vital it did make gameplay pretty much impossible. Guess I'll have to wait a couple hours for the sun to go down.
How common is this? It's an unusually bright day, and I played yesterday afternoon with absolutely no ill-effects. Is this just a once-in-a-great-while problem that occurs on crazy bright afternoons, or should I be shopping for some darker curtains?