I took delivery of a March 5th-built X at the end of March, it was running 2018.12. Last week it upgraded to 2018.14.2. I've noticed a drastic change in how the audio sounds. (This is with the Premium Upgrade Package, so with the up-rated Tesla sound system and new MCU.) Sound one-offs, all on 2018.12: * Audio dropped completely on my second day of daily driving, until I turned-off the car using the e-brake menu (later found the thread about the two-button reset not working for most/all of the new MCU cars). This hasn't resurfaced, but included all audio, including chimes, tones, bings, and bongs. It was truly quiet ride to work, although I did completely miss the "hands on the wheel" alerts (I apparently don't apply enough counter-force when it's on a straight but bumpy road). * Outgoing Bluetooth audio failed a few days ahead of 2018.14.2 rolling-out, while things like voice-input (Navigate to...) continued to work. (This time, I think I just tried it again the next day and it was working again.) Regularly on 2018.12, the audio seemed to drop the mids significantly; at first I thought there might be a loose wire or two going to one or two of the front speakers because it seemed intermittent, but eventually it looked more like a software issue. With 2018.14.2, the software mixer seems to be closer to what seemed like the "problem" state on 2018.12. At first I tried pushing the mid and lower-mids all the way up to try and get the same sound, but eventually pulled them back down. The treble now seems particularly clear, so I dropped that down; I'm actually wondering if the change is that they cleaned-up some software low/high pass filtering. Regardless, over the (two, I think) days of commuting with 2018.14.2, I haven't heard the same intermittent changes I had with 2018.12. I still find the lower-mids and mids to be under-represented in the default settings (whereas generally I'm biased towards pushing the upper-mids and bass, or dropping the mids for a similar effect). Has anyone else noticed a similar change in, presumably the software mixer, between 2018.12 and 2018.14.2? Had anyone else experienced similar sound issues under 2018.12, or have a similar observation with the mids? My concern is that something is wrong, or will be wrong again, although after adjusting the mixer and listening to it for a couple commutes, I'm thinking something might actually have *been fixed*. As far as I can tell, I've noticed no change in any of the chimes or system voices (navigation), other than during the one-off where all audio was absent. I reached-out to OA after the initial issues on 2018.12, who said he forwarded it on to the SC where I took delivery, but I haven't heard anything back from them (although I'm also waiting on an ETA for some parts from the due bill).