Windows XP Machines Losing Network Connectivity

Starting yesterday, some of the Windows XP machines in our environment have been dropping off the network seemingly at random.  The only thing that fixes it is either rebooting or renewing the IP address (even though it will get the same address it will suddenly work).  There are no errors showing up in the event logs of the machines and I ran a DCDiag on the domain controllers and everything checks out.  We have also ran a few AV and Spyware scans on some of the machines and can't find anything.

Anyone have ideas on other things to check or what could be causing it?
PunkGeekAsked:
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bcrosby007Connect With a Mentor Commented:
Check your DHCP Server.
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davealfordIt SupportCommented:
Have you tried disableing the "Allow the computer to turn off this device to save power" in the adapter properties?
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Joseph MoodyConnect With a Mentor Blogger and wearer of all hats.Commented:
I second the DHCP server.

When your machines are losing network access, are they getting a 169 IP address? If so - set the IP to a manual address within your subnet and see if you can ping other devices.
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bcrosby007Commented:
Are you getting a popup about IP address conflicts? IE - another computer on network with same ip.
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PunkGeekAuthor Commented:
There are no IP conflicts.  The DHCP server isn't showing any issues in the logs and seems to be handing out IPs properly and the machines have valid addresses for our network.  Our phones, Windows 7 machines, Win2003/2008 servers, linux boxes, and other devices on the network are not being impacted at all.
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bcrosby007Connect With a Mentor Commented:
Check the power settings on teh network card driver like davealford said.
You could try a static ip as well. If the static stays active and legit, then your network card is probably ok as far as hardware is concerned.
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PunkGeekAuthor Commented:
Well, we found an additional DNS server address that was showing up on peoples machines when they were suddenly failing.  Turns out that some auditors were in the building and decided to plug in their Netgear Wireless router without telling anyone.

Thanks for the help thinking this through guys.
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Joseph MoodyBlogger and wearer of all hats.Commented:
No problem. You may want to configure your DNS server options through DHCP. Then standard users can not change this.
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PunkGeekAuthor Commented:
We found an additional DNS server address that was showing up on peoples machines when they were suddenly failing.  Turns out that some auditors were in the building and decided to plug in their Netgear Wireless router without telling anyone.
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