The harness becomes loose without pressing the button to loosen it. When I pull on it to make sure it is tight, it loosens without pushing the button. Nuna has been notified but will not provide a timely solution. I did not receive a recall letter in the mail even though my car seat is registered with the manufacturer and has been since 2021. I called Nuna and they said they could not find my registration and to re-register online then I should receive a letter about the recall. I re-registered approximately a month ago and still have not received any letters. Nuna told me to immediately discontinue the use of the car seat but did not provide a timely solution. They stated a cleaning kit would be mailed but that it was not ready to be shipped yet and they did not know when it would be ready. I asked to be sent a replacement RAVA that was not affected by the recall and Nuna said they would not provide a replacement or a refund. Nuna is putting all the responsibility and liability on the parents by sending a cleaning kit that the parents have to do. I am not a trained or certified car seat technician and do not feel comfortable putting my child at risk if the cleaning kit ds not work or if I am not able to clean it correctly. I was told that Nunas head supervisor, Melissa, would call me, however she has not called me back. Nuna refuses to offer a refund, a replacement seat, or a repair in a timely manner nor a repair that has been crash tested. By sending the kit to the parents, Nuna is putting the liability and responsibility of the childs injury or death on the parents even though it is NUNAs product recall and fault. Nuna is not accepting any phone calls anymore either. I also asked Nuna if they would provide a reimbursement for the new car seat I had to buy since I had to discontinue the RAVA immediately, and I was told by Nuna that they would not provide any reimbursement, refund, or replacement seat.