As with all electronics these controllers will go bad after a while and you started you've had them for a few years. It may be that they've just reached their life span. The censors and stuff in the controllers do eventually burn out I hear
I have had my Wii system for a few years and have 2 remotes (w/o motion plus) I use with it. For several months now I have had issues with my remotes operating - battery drainage (using a brand new rechargeable system), not seeing the "hand" on screen, won't turn off the system. Do these remotes go bad? Is it the system or the sensor bar? Don't know whether to go buy brand new remotes or what to do. Very frustrated cuz games are gathering dust instead of being played.