LinkSys WRT160Nv2 drops connectivity to individual computers on my home network

I have 2 MacBook Pros on my home WiFi network. Periodically and individually, they will each lose connectivity to the network and the internet. A workaround is to cycle the WiFi on the computer. The wireless router is out of warrantee so don't have access to support. Any ideas why that might be happening?
Supporting Info:
Both MacBooks are running MacOS X 10.6.7 (latest)
I downloaded and installed the latest firmware version for the WRT160Nv2 (v2.0.03)
The MacBooks are within 10 feet of the WiFi device
To get better coverage in the house I installed and configured (according to both LinkSys and the other manufacturer) a WiFi repeater/extender (Engenius ERB9250 Wireless Range Extender)
Any help you can provide would be appreciated.
DM

Go to the setup page, click on Wireless > Advanced Wireless Settings
Change Beacon Interval to 50, Fragmentation Threshold to 2307 and RTS Threshold to 2306.
Seems to work wonders for people having this type of problem.

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Hi wrkeen,
Please share more details about this issue：
1. Provide the error messages for better analyzation.
2. What solution have you done to test the homegroup?
If we enable the network discovery, we will be able to find other computers or devices on the network.
Please take the following steps for troubleshooting:
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http://windows.microsoft.com/en-us/windows7/using-the-network-troubleshooter-in-windows-7
2. Go through this path Control Panel\Network and Internet\Network and Sharing Center\Advanced sharing settings and check if we correctly configure file sharing and other settings.
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http://windows.microsoft.com/en-us/windows-vista/troubleshoot-file-and-printer-sharing
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Fangzhou CHEN
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