Does it happen when you drive the car for a while, then let it cool off for like an hour, and hop back in and drive?
This is a pretty common issue with the 7AT. MyG37 has lots of discussion about it. I personally experienced the same issue when I had my 09 G37. It seems to be a torque converter locking/unlocking mechanism.
I know Nissan has just released new software update for the G (09, 10, 11, and early 12), not sure about the Z. Ask your local dealer if they know about it.
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