I'm on Day 27 of driving a Model X P100DL loaner (yeah, I know) as I wait for Tesla to figure out how to get a truck to transport my 2013 Model S from San Diego to New Mexico and then return the X to SD. I am now experiencing a strange shimmering sound when driving on Interstate 25 (speed limit 75) here in NM. Here's the SoundCloud link to a brief recording of the sound: strange sounds at 75mph on Interstate 25 in a Model X P100DL loaner (heads up: SoundCloud in their infinite wisdom will start auto-playing other recordings once this 23-sec clip finishes) Some info about the sound: • It’s intermittent • Does not appear that any driver action triggers it (starts/ends on its own, regardless if I am accelerating, rolling, or slowing down w/ regen) • The PITCH of the audio does not change based on speed of vehicle.. • It generally happens right around 75mph • It did also very briefly happen around 55mph • Does not happen on slower city/rural roads. • All windows were closed and AC off when I recorded on iPhone. • No personal belongings or boxes or metal objects stowed in car — this seemed to be coming from under the car, like one of the Drive Units, or suspension? • It did not seem like wheel/brake noise — the sound was more centered, not coming from a specific wheel or anything. Any ideas?