AirPort WiFi on 2010 MBA won't stay connected to 5Ghz band since latest 10.6.7 update.

I updated my 2010 MBA 11" to the latest/greatest of everything in prep for Lion. So, I now have 10.6.7 of course. But ever since the updates, I noticed that my wifi on the MBA won't stay connected to the 5 Ghz band of my router. It'll connect fine to the 2.4 Ghz channel, so its not a big deal, but this is my first weird issue with the Mac (I converted in January), so of course it bugs me.
Anybody else having the same issue? Since Lion is around the corner, I can get by using the 2.4 band and hope its not an issue in Lion. But part of me wants to try to use my TIme Machine backup right before I updated to see if it is truly related to the updates.
Thanks!
John

Forgot to mention, I have a Netgear WNDR3400 N600 Dual Band Wireless Router. But like I mentioned, it has worked perfectly for 5 months previously.

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