I've had one or another Rubicon w/frt. & rear lockers for over twelve years now. Never had a problem with the locker sensors. Can't remember reading on any of the boards where an unusual number of folks were having the issue, either.
if you don't want the sensor, plug up the hole. Put a piece of tape on the dash so you won't be bothered by the blinking light. Please don't come on the board and create fear among the members over something that's not happening. We have enough issues with these new young Jeep owners who have never turned a wrench. You can tell who they are. They're the ones who are more interested in "how do my wheels looks", or "what have you done on your Jeep today" or "what color should I get"? They are on ALL the Jeep boards.