The rear seat seat belts locking up creates a very serious safety hazzard, since the passengers must release them and reset them, even while the vehicle is in motion. I can't stop every time they lock up. It doesnt happen all the time, but enough to be very annoying and is a safety issue. I've checked with other Nissan Titan owners and most have the same problem. Even Nissan admitted to the problem, but all they do is replace the belts with new faulty ones. It doesn't fix the problem, and they've said they can't do anything.