Mac Mini 2010 OS X Lion Stalled WiFi Connetion

I have a 2010 Mac Mini that has been upgraded to 10.7 from 10.6. It is fully patched. I've been experiencing dropped or stalled wifi connections where the system still shows 100% signal from the Airport Extreme Base Station. My base station has the 5GHZ and 2.4GHZ bands enabled, so I have switched between them when they stop working. It seems to work for about a minute after moving from band to band. Airport Utility ends up having the Base Station and the Internet icons turn orange.
I read an article about resetting the SMC and creating a new network location, but that hasn't seemed to help.
I've checked the Console log and I can tell that this is now affecting my Time Machine NAS backups.
What's next?
On a (probably) unrelated note, I did have some issues with the internal DVD drive in the past couple weeks. I'm not sure if I'm dealing with a hardware or software problem at this point.

Hello,
and creating a new network location, but that hasn't seemed to help.
Did you try all these steps?
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.7…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
Click OK.
Also, turn off IPv6:
System Preferences » Network » AirPort » TCP/IP tab » Configure IPv6
Or whatever Interface you use.

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EtreCheck version: 1.9.15 (52)
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