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It does sound like a network problem versus a problem on your windows box. Could be something in common between the configurations but not enough information to know that yet.
Do you have one or two DNS servers defined?
If your systems are using DNS provided by your DHCP server, does the DHCP server (your router?) have one or two defined? Are they functional?
As Bamrak said, I'd suspect the router. The unsual piece is that they fix themselves. Usually, when routers lose their mind they require a reboot before they'll come back. It's unusual for them to spontaneous fix themselves, rather they get progressively worse.
What firmware version in the router? Looks like RP114 firmware went up to v3.26.
Are you running any p2p apps? Their default settings will often overload soho routers. Keeping the maximum connections below 200 can help.
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