Very strange... have you tried to re-sync using the red button inside the Wii (where the SD card would go the red button) and the Wii motes red sync button where the batteries go? Or do you mean you have tried to re-connect the Wii mote by pressing the "Home" button and "Connect" (if you get me)
Also try turning the Wii off for about 2-3 mins or check batteries... these are all the simple things I can think of?
But there are many more helpful people on WiiTalk so stick around and I am sure you problem will get resolved
Oh... Welcome to WiiTalk
Rick