2018.20 Audio Equalizer
Since I got the car, the audio has had issues, including the significant change brought in 2018.14.2. Throughout this, I've had to resort to some pretty severe curves to get reasonable (although not exactly great) sound out of the car. I rebooted the car while driving today, which not only stopped a series of pops and drops similar to the one described on day-three, but also seemed to provide the first full-sounding experience I've gotten out of the speakers, and pretty good sound with a flat curve. This last thing is interesting in itself, as it finally provides a concept of what I should be expecting from the premium audio upgrade.