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You'll want to enable DNS Scavenging<br />
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<a href="http://technet.microsoft.com/en-us/library/cc771362%28WS.10%29.aspx" rel="ugc">http://technet.microsoft.com/en-us/library/cc771362%28WS.10%29.aspx</a>&nbsp; 
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You'll want to enable DNS Scavenging

http://technet.microsoft.com/en-us/library/cc771362%28WS.10%29.aspx [http://technet.microsoft.com/en-us/library/cc771362%28WS.10%29.aspx] 

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Appoximately every 2-4 weeks I get a call about poor performance browsing the internet. &nbsp;Each time, I end up clear the DNS cache on my 3 Windows Server 2008 DNS servers and then internet browsing speed improve dramatically.<br />
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Anybody know if maybe there's a setting or configuration I can modify to prevent this from happening?
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Appoximately every 2-4 weeks I get a call about poor performance browsing the internet.  Each time, I end up clear the DNS cache on my 3 Windows Server 2008 DNS servers and then internet browsing speed improve dramatically.

Anybody know if maybe there's a setting or configuration I can modify to prevent this from happening?

Have to clear DNS cache about every 2 weeks

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.