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This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.

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Here is the setup: 2 DCs for internal domain with AD integrated DNS all set to use root hints to resolve external URLs. Two of the DCs are 2008 R2 server core and one is Server 2008 full GUI. Recently the two server cores starting having issues. They will stop resolving .biz domain names, but the 2008 DC continues to resolve properly. Quick resolution is to restart the service on the server core boxes, but eventually those DNS/DCs will stop resolving .biz again. Ideas?
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Here is the setup: 2 DCs for internal domain with AD integrated DNS all set to use root hints to resolve external URLs. Two of the DCs are 2008 R2 server core and one is Server 2008 full GUI. Recently the two server cores starting having issues. They will stop resolving .biz domain names, but the 2008 DC continues to resolve properly. Quick resolution is to restart the service on the server core boxes, but eventually those DNS/DCs will stop resolving .biz again. Ideas?

Server 2008 R2 DNS

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.