Time Capsule assigns wrong IP to Macbook Pro upon wake

Hi,
This is driving me nuts, I hope someone can help.
First off: I have latest OS 10.5.7, Airport, and Time Capsule updates available today. This problem has been occurring since before 10.5.7 came along, and before the last Time Capsule firmware update too.
Time Capsule is running in 5ghz N-only mode. The IP 10.0.1.37 is reserved/assigned by MAC address for the MBP.
About 40% of the time when I open the lid of the MBP to wake it, I have no internet access but can access the Time Capsule disk. When this happens, I check the IP of the MBP and it is assigned 10.0.1.101 which is incorrect. If I click the "renew DHCP" button from the TCP/IP tab in Network Settings, it immediately re-assigns 10.0.1.37 to the MBP and then internet works fine.
I previously did not have a static IP assigned to the MBP and it had the same problem.
I have tried both lengthening and shortening the DHCP lease time but still have this problem.
We have a black MacBook running the same OS purchased at the same time that does not experience this problem at all, and does not have an assigned IP.
An Airport Express with Xbox 360 attached is also on the TC wireless network with no problems.
I believe this issue started happening when I switched from N/G-compatible mode to N-only mode. I don't want to slow it back to G-compatible if possible.
I welcome your suggestions. Thanks.

Time Capsule has now been assigning the MBP IP 10.0.1.105 now.
No one has any ideas on this?

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Press and hold the reset until the TC flashes rapidly and redo the setup.
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Factory reset universal
Power off the TC.. ie pull the power cord or power off at the wall.. wait 10sec.. hold in the reset button.. be gentle.. power on again still holding in reset.. and keep holding it in for another 10sec. You may need some help as it is hard to both hold in reset and apply power. It will show success by rapidly blinking the front led. Release the reset.. and wait a couple of min for the TC to reset and come back with factory settings. If the front LED doesn’t blink rapidly you missed it and simply try again. The reset is fairly fragile in these.. press it so you feel it just click and no more.. I have seen people bend the lever or even break it. I use a toothpick as tool.
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1. Use very short names.. NOT APPLE RECOMMENDED names. No spaces and pure alphanumerics.
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2. Use all passwords that also comply with 1. but can be a bit longer. ie 8-20 characters mixed case and numbers.. no non-alphanumerics.
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5. Mount the TC disk in the computer manually.
In Finder, Go, Connect to server from the top menu,
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6. Make sure IPv6 is set to link-local only in the computer. For example wireless open the network preferences, wireless and advanced / TCP/IP.. and fix the IPv6. to link-local only. Do the same for ethernet if you use it.
There is a lot more jiggery pokery you can try but the above is a good start.. if you find it still unreliable.. don't be surprised.
You might need to do some more work on the computer itself. eg Reset the PRAM.. has helped some people. Clean install of the OS is also helpful if you upgrade installed.
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Macbook can't find Time Capsule anymore
Start from the bottom and work up.. I have a list of good network practice changes but I have avoided Yosemites bug heaven.
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Thank you for using Apple Support Communities.
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Time Capsule assigns wrong IP to Macbook Pro upon wake

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