MacBook Pro randomly drops Ethernet connection.

I use my new MacBook Pro both connected wirelessly and via Ethernet to my home network. My network is connected to ADSL via a firewall/gateway router. I have a Powerbook G4 and a WinXP machine running on this same network (wirelessly and wired) without any issues.
For some reason my new MacBook Pro, however, will randomly drop off the network and will often require a reboot to reacquire a DHCP address. At first, I noticed this when transferring large amounts of data to the laptop across the network (retiring my XP machine). I thought I may have a bad cable or bad port on my hub so I switched both. After a couple more transfers, however, the problem seems to have returned.
Mid transfer, the MBP will lose connectivity to the DHCP server and assign itself a 169 address. I am unable to reacquire a 192 address from DHCP and have to restart the MBP to get back on the network.
Needless to say, this is very annoying and not at all what I expected with my new MBP.
Any thoughts appreciated as I am at whits end on this one.

I am having a similar issue. I have not yet tested with standard Ethernet, only Wireless using WPA2.
I have 3 Macs (iBook G4, PowerMac G5, and MBP (Core 2 Duo) all connecting a private wireless network consisting of a Airport Extreme and an Airport Express using WDS. All computers and basestations are running the latest versions of their respective software (10.4.8, V5.7, V6.3)
ONLY the MBP has the following problems: dropping the connection, failing to reconnect after sleep, and failing to obtain an IP address via DHCP after connecting.
The signal power reported by both the menu-bar widget and the Internet Connect application varries continually on the MBP, even though it is sitting 2 feet from the Airport Extreme basestation. Sometimes full strength, sometimes only two bars.
I have removed all preferred networks from the Network system preferences and re-added only my network. I have also removed the passwords for the routers from my keychain.
The MBP will often-times simply drop it's connection. When it does that, it will not automatically reconnect to my network. If I put the MBP to sleep it often-times will not reconnect when it awakes either. Sometimes it does, but I cannot decern a pattern. If it does automatically reconnect it will usually not obtain an IP address from the basestation.
Simply toggeling the MBP's Airport off and then on will almost always get it to find my network and automatically connect. Even if it does connect to the network, it doesn't always obtain an IP address via DHCP. Again, if I simply toggel the MBP's Airport off and on then it will usually connect and obtain an real IP address.
All of these things happen within two feet of the basestation, as well as more than 20 feet away. Both other Macs continue working just fine even while the MBP is having problems.
This is not an issue with the basestations or my configuration. It must be a problem with the drivers for the Airport card in the MBP.

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    How to diagnose and resolve Wi-Fi slow-downs
    Pv6 troubleshooting
    Mac OS X 10.6 Help:  Solving problems with connecting to the Internet
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    23/10/2012 23:44:47.000 kernel[0]: AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving).
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    23/10/2012 23:44:47.928 mDNSResponder[49]: DeregisterInterface: Frequent transitions for interface en1 (10.0.2.11)
    23/10/2012 23:44:48.057 eapolclient[241]: en1 START
    23/10/2012 23:44:48.000 kernel[0]: MacAuthEvent en1   Auth result for: 00:1a:92:b7:b9:3f  MAC AUTH succeeded
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    23/10/2012 23:45:49.636 eapolclient[241]: en1 STOP
    23/10/2012 23:45:49.955 eapolclient[252]: en1 START
    23/10/2012 23:45:50.000 kernel[0]: MacAuthEvent en1   Auth result for: 00:1a:92:b7:b9:3f  MAC AUTH succeeded
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    23/10/2012 23:46:31.213 Dock[130]: CGSReleaseWindowList: called with 5 invalid window(s)
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    23/10/2012 23:46:47.031 Dock[130]: CGSReleaseWindowList: called with 5 invalid window(s)
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    Thanks,
    Mak.

    You may have already tried some of these suggestions -
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