I called the Kia Concierge number the other day because, on three occasions, I've started the car and gotten virtually no audio from any source - radio, bluetooth, etc. (if you turn it up to max you can barely hear it, though still muffled). They told me about PS573 and that my head unit needed to be replaced. Not thrilled about having the dash torn out for it, so I've not pressed it. Told my service writer about it today because I was there for an oil change. He didn't think they'd replace it unless they could reproduce the problem.