I came hunting for this topic on forums because I was having the same problem last night, and it drove me nuts. I was playing Wii tennis with my wife-to-be and my remote kept turning itself off, no warning, just all of a sudden all the blue lights would go off and the ball would go by me because I couldn't swing. Then I'd have to hit the A button and all 4 lights would blink and then my remote would come back on with the 1st dot lit (because I was player 1). Hitting the home button also showed my battery life to be full. I have never smacked the remote on anything either to damage it.