Netgear wndr3700v4 wireless 5ghz frequency Channel problem

Configuration: Country US & Mode N & Width 40M

CH165 does not work.

But CH161 is ok.

5ghz frequency Channel

Does anyone know why?

I had also an issue with the chanels of the 5Ghz on my Netgear DGND3800B i could set it to Chanel 42 but it did not work with it ... My solution via google see this link scroll down there to the 5Ghz list Chanel 42 is simply not listed.
If i use any of the Chanels listed there they work. Hope this helps