The contact owns a Nuna Car Seat, Model Type: Rava, Model Number: CS05103CVR, Manufactured Date: 09-04-21. The contact stated that upon inspection, the harness straps loosened independently without the release button being depressed. The contact received notification of NHTSA Campaign Number: 24C002000 (Child Seat); however, the part to do the recall repair was not yet available. The manufacturer was made aware of the failure.