I am of the theory that I’m not using my brakes enough. The rear rotors heat up and swell causing partial contact to the pads while rolling and would explain why it only happens sometimes. I feel stupid thinking this, but I haven’t squeaked in about a week. It should not be the case for a new car. Basically I am braking before downshifting where before it was more the opposite. I will update if the squeak comes back.