I just noticed my c-2 button is not working.........not that I use it much (very rare) but all of a sudden its not working ...never dropped the controller. GRRR   cheap plastic.

fixed it....... the plastic inside the back cover that holds the screws broke.  I took apart an old pc mouce that had small screws that were slightly larger than the stock screwsand was able to screw them in to hold the pc board. put it bk together now it works fine.