Windows Server 2008 R2 and Windows 7 DNS Problem

Hi,
I have a DNS Server hosted in Windows Server 2008 R2 and our clients are using Windows 7. All are working fine then suddenly there are times that our client cannot access our internal site and cannot connect with our IM which is also hosted in the server.
Tried to ping the server's IP but got this result: 
Ping request could not find host .com. Please check the name and
 try again.
NSLookup works fine. Tried to use the ip address instead of the domain name and it works. Resetting network connection seems to resolve the issue but we cannot do it all the time especially when we have hundreds of computers in our office. Anyone have ideas
regarding this?

Hi,
“Resetting network connection seems to resolve the issue but we cannot do it all the time especially when we have hundreds of computers in our office. Anyone have ideas regarding
this?”
It seems is the client IP address conflict, it may cause by your DHCP Conflict Detection Attempts value setup is not appropriate. You can try to set Conflict Detection Attempts
to a value other than 0.
More information:
Detect and Avoid IP Address Conflicts
http://technet.microsoft.com/en-us/magazine/ff606371.aspx
Hope this helps
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are trying to better understand customer views on social support experience, so your participation in this
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