Nah...my 350Z used to do a low-sounding groan when it'd go into reverse all the time. It's normal. If it's not that, also make sure your foot is firmly planted on the brake pedal - it could've just been your pads on the rotor.
My 350Z was an AT too, btw. The 5AT and 7AT are virtually identical in design, with the only difference being an extra 2 gears. I'm not surprised if the 7ATs make this noise too.
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