The contact owns a Nuna Safety Seat, Model Number: CS05103ROS, Model Type: Rava Convertible, Manufactured Date: September 21, 2023. The contact stated that after buckling the shoulder straps of the car seat, the contact pulled the shoulder traps to verify that the shoulder straps were securely tightened. The contact noticed that the shoulder traps extended abnormally and were not securely tight. The contact noticed the failure while the car seat was being used by her daughter. The manufacturer was notified of the failure and advised the contact to ship the defective car seat. The contact shipped the car seat but had not heard back from the manufacturer yet. The car seat was not replaced. Additionally, the contact received a notification of NHTSA Campaign Number: 24C002000 (Child Seat); however, the part to do the recall repair was not yet available. The contact stated the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was contacted but no assistance was provided.