Airport Extreme & Internet Connectivity - Motorola SB6120/ Comcast Cable

I recently (June 14th, 2010) purchased an Airport Extreme.
I'm having troubles with intermittent drops of internet connectivity.
The router is connected wan side to a Motorola surfboard 6120, and from there to Comcast cable service. Wired LAN side, I have the router connected to another switch. I also use the wireless for my iPad.
When started, the router works just fine. But in ~ an hour it seems to drop the internet connection, or at least stops routing out to the net. There is no LED indication on the front panel that anything is wrong (on both the airport or the modem). And in the Airport Utility, it still lists my public IP etc etc... and there seems (to me) to be nothing enlightening in the stats and logs screen.
Once back on my old router (Linksys), there is no interruption in internet connectivity. So, I'm fairly confident this is the apple router misbehaving.
Any help would be greatly appreciated.

Welcome to the discussion area, jbuffat!
+When started, the router works just fine. But in ~ an hour it seems to drop the internet connection, or at least stops routing out to the net.+
This is a classic symptom of some sort of wireless interference that is affecting the Apple router. It's not unusual at all for one manufacturer's router to work well and another have problems in a given location. I've had the exact reverse of your issue with the Apple router working great, but Linksys slowing down and losing connections.
The culprit is most likely a nearby cordless phone, either yours or even a neighbors. If you have cordless phones there, try turning them off for a few hours to see if the problems continue. If they don't, you have your answer.
A nearby wireless network at the neighbors could certainly be causing problems as well as a new security system nearby.
Without trying to be scientific about this, the easiest probable solution is to start changing the wireless channel on your AirPort Extreme to see if you can find some clear airspace. Keep experimenting until you find a good channel or run out of channels.
Macintosh HD > Applications > Utilities > AirPort Utility
Click Manual Setup
Click the Wireless tab below the row of icons
Set the Radio Channel Selection to Manual to try different settings

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