WRT160N: Channel Width from 40MHz changes to 20MHz

Hello,
It's been a long time since my last post... but here I am again.
I have bought a Linksys WRT160N. I'm running the latest firmware v3.0.03.
I also have an Alienware with a Dell DW1520 (Broadcom chipset).
My issue is this one.
I set on the router to work at 20 or 40 MHz as Channel Width.
Check my settings:
And I get this status values on the router:
And this values on the computer:
As you can see, I get 20MHz and not 40MHz... So I don't get on my computer the 300Mbps... and get just 130Mbps.
After a router reboot, I get the correct values of 40MHz.
Check the router:
And the DW1520 WiFi card:
Here is a picture of the networks arround my router:
Any ideas what's wrong on the router?
Thanks for your thoughts.
Solved!
Go to Solution.

Nothing is wrong. You have a lot of other networks in your proximity. The router will first try to use 40 MHz bands when requested until it finds that due to interference with all those other routers you'll get a more reliable and faster connection when using only 20 MHz bands. Thus the router reverts back to 20 MHz only.
That's exactly how it should work for best results...

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