In mid-2021, the Mazda Connect infotainment system suddenly stopped working. Upon starting the car, the software boots over and over again. The Bluetooth is inoperable; radio plays but I cannot change stations; steering wheel functionality of these features is absent; backup camera is intermittent and dimmer. The latter is a safety issue. The Mazda dealer diagnosed a malfunction of the connectivity master unit (CMU) and said they have had a rash of the same problem with 2016's recently.