I recently purchased a 2017 G80 3.8 Ultimate, and although I really like this car, I noticed a rattle over bumps (don't hear it on smooth highways). The rattle sounds like metal, maybe a spring or coil? Only thing is I cannot determine where exactly it is coming from. At first I thought from the rear seat area, perhaps the lid where the rear speakers are mounted, or perhaps the rear sunshade. However, after taking it in today and getting a loaner, the loaner is doing the same thing and now it sounds more like it is coming from the front console area. The loaner is a base model, so it wouldn't be caused by anything on the option packages. Has anyone experienced this yet? If so, have you been able to isolate what is causing the noise? Thanks in advance!