Airport base station isn't accepting some connections...

I have an 802.11n "fast ethernet" model.
It's set up to use WPA2, and doesn't advertise its SSID.
For fun, I also have a couple of other base stations (Both the UFO Extreme and a couple of expresses - they're usually unplugged/inert).
It had been working great...
Then, a couple of weeks ago, I started noticing some odd behavior:
It used to be that if I disconnected my MBP from it (by sleeping it, etc), when I opened the lid, my MPB would simply re-connect automatically.
I don't recall making any configuration changes to my machines, network, or base station.
I now have to manually enter both the SSID and the WPA2 password every time I wake up my mac. (In spite of the fact that the keychain is storing the value, and I've verified this with keychain access).
If I have one of my 'other' base stations active (with its own config, of course - a different SSID & password, but otherwise configured with a hidden SSID & WPA2), my mac would connect to the 'other' base station instead of my 802.11n base station. (The preferred network order for the 'other' station is dead last, and for the 802.11n is first).
And other devices that connect to the 802.11n network (ie. iPod touch, for example) are also having issues - it's only on the 2nd attempt that I'm getting a connection.
The fact that the problem is only happening when I connect to the 802.11n base station has me thinking there might be something wrong with my base station config - though I have no idea what.
I have no problem with auto-connecting to an 802.22b/g "UFO" base station or an AirPort Express using a hidden SSID & WPA2.
Does anybody have a clue what is wrong?

When I reconnect, I do get the same IP address as before. This is because the airport isn't distributing IP addresses. I've got a Linux box running DHCP to handle ip address assignment. Since I have full control of the DHCP config on the linux box, I can set my own lease times, etc.
Your problem seems to be that you can connect to the airport, but aren't getting an IP address. I wish I could help you with that one, unfortunately I've never really used an AirPort outside of the wireless bridge mode - my Linux box does the Firewall, NAT, DHCP, DNS, etc.
Part of the reason is I'm not too fond of the AirPort base station's presence on the net - instead of simply dropping unsolicited packets, the AirPort will send a message that it is refusing the connection. In other words, AirPort isn't invisible on the internet, making it a bigger target for crackers & script kiddies.

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