After 3-4 weeks with the X, I am noticing a loud and annoying buzzing sound. It goes away when I turn off the AC, so I assume it is related. (But it comes back when I turn it back on.) It comes and goes but is very prevalent when it happens. TS has it now and is trying to track it down. Interestingly, the Model S loaner they gave me does the same thing. Clearly, this is not normal, and it did not do it for the first few weeks I owned the car. Anyone else experiencing this?