Hey, the same thing happened to me on Saturday. I turned my back on my friends for just a second, and then they come to me saying that the remotes won't work. The lights would flash, indicating battery power (3 squares for the first Wiimote, 4 for the second), but would flash for as long as they normally would if one were turning on their console. I kept trying to sync the remotes back up to the Wii, but to no avail, also. After resetting the console a time or two, the remotes worked again. This has puzzled me ever since as well. Can anyone explain what the problem could possibly be?