Not sure if this is limited to my car / phone / connection, but I've noticed that when my iPhone is connected and using CarPlay - the audio will sometimes revert to a feed that has a lot of cracks and pops along with the song. For example, I could be listening to audio for 10 minutes without an issue, and then I'll hear a small pop and then all audio after that point in my playback will have a lot of crackling and popping. When this happens, I'll disconnect my cable and plug it back in - everything is fine once reconnected and playback starts back up (when I disconnect the cable, I've tried both from the usb connection to the car and also from the lightning connection to the phone - both fix the issue). This is on the 7 speaker configuration on the regular GT model. Using an iPhone SE with an apple-branded cable. Cable appears to be in good shape.