2018 x 100D, left side getting this rattle noise around 73,000 miles, getting worse 75,000mile, have service center check it out they stated it could be bad lower control arms, ended up replacing all the control arms myself, it was a little torn on the bushings in the front lower control arms, at the same time I replace the tie rod link and installed the n2itive camber kit, rattle still there when going over bumps. remove the left air struct and tighten the blot, all rattles gone, after test drive, remove the right side to check it was not loose at all. after the DIY, alignment at 3rd party, Service Center recalibrate the air height and depressurized the air system and refill with nitrogen, SC charger under $100 usd for both services. at 76k miles now, no leaks or noise yet. Hope it last at least another 70k..