Sorry for the late reply but I just noticed it.
I now have 2 i2, 1 i2se and 3 x2 units of various years.
Any unit built after 2014 has a much cheaper gearbox and makes sounds identical to yours as well as the increased gear whine when gliding.
The older units run much quieter than my 2016 i2se but the forward/backward gear lash is present on all units.
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