My 2007 4.0 with 67,000 miles on it does the same thing. I've chalked it up as normal, been like that since I bought it with 52,000 miles. It is the clutch fan on mine, never though it was an issue as it disengages/engages as it should.
2007 Nismo 4x2, 4.0 Auto - Sold
New ride - 2008 VW Jetta SE - 5 Speed manual