For the first time, I rode in the rear seat of my 07 Accord sedan EX-L V6 and found a problem with all three seatbelts. After I hooked them up, the shoulder straps just got tighter and tighter under normal highway driving conditions- a constant 65 MPH. There was no free play in them and the only way to loosen them was to open it, let it retract all the way in, then pull out and refasten. as there is in the front seatbelts. What's that all about?