Dhcp Bad addresses and IP conflicts

My Windows 2003 server is suddenly having problems assigning IP addresses.
Users report an IP address conflict and DHCP shows Bad address IP already in use.
The are kicked off the network and they end up with a 169.254 address.
I've checked for rogue DHCP servers and I only have the one I was expecting.
I'm ending up with about 45 out of 160 ip's the are coming up bad.
If I delete them and refresh they'll come up without the problem at first but after several minutes they will come back one at a time.
NWI2007Asked:
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Naitik GamitSoftware DeveloperCommented:
-> Open the DHCP administrative console.
-> In the console tree, click the applicable DHCP server.
-> On the Action menu, click Properties. For Windows 2008, you first need to highlight IPv4. There is no option for configuring IPv6 scopes.
-> Click the Advanced tab.
-> For Conflict detection attempts, type a number greater than 0 (zero) and less than six, and then click OK.

look at the attached image.
n.jpg
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
Found a similar post and have a look on it.

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/Q_25127618.html

Also make sure that you VLANS/Switches do not cause any issues.

Zac.
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