According to Nissan, there's a software error in the controls that inject the proper chemical mixture in the airbags. Once that mixture is out of whack, the airbags will probably not deploy when you need them most.
The best way to find out what's wrong with a vehicle is from the people who drive them. Not only do owner complaints help us rank vehicles by reliability, but they're often used to spark class-action lawsuits and warranty extensions. Plus, they're a great way to vent.