click underneath the drivers seat

No ratteling here, maybe I got a good one (from factory 5).

I do not hear a click when braking from higher speeds,
but such a sound might be hidden by the road and tire noise.

Joke:
And, hidden by the loud screeching of the brakes,
the ABS noise, and the people screaming!

 

I have the exact same symptom.
I hear a single click that sounds like the sound a wrench handle makes when it hits the frame on a car.
I hear it once half way through acceleration, and then once half way through deceleration. it's reproducible especially when going up hill: I can hear it when pressing the accelerator and when not pressing accelerator but due to the uphill factor, the speed changes more rapidly, no brakes involved.

I have a Monday appointment for the service department to look at this problem and a problem with the display buzzing intermittently on startup.

 

I have this same problem. It has something to do with the part that moves the seat up and down. the higher i have my seat the more it does it, and if i lower my seat it will not do it.

 

I believe somebody posted having the same issue, and that there is a TSB which addresses the issue.

 

The dealership was unable to replicate any of my issues. I got nowhere with them on this issue.
I plan to test drive with the tech next time when I get time.