it happened to me this morning - i just had to resync with the button under the battery cover. also i found out that this is how you can tell how much battery power you have left on the wiimote without turning on the wii. just press the sync button on the wiimote while the wii is off and it lights up how much battery life you have left. 4 lights full power, 1 light almost empty etc...
07/01/2007
The Big Blue Velour Marble