IP address in use by some other IPv6 client

In my network I have several imac G5s, suddenly they have began losing their IP addresses? OK not losing but another IPv6 client is using the IP addresses, that have been used by these machines for some time. In the past I have manually made up IP addresses and that has worked, rarely. The DHCP Lease is giving me IP address's that do not work. These machines are connected through an Ethernet hub. Recently I tried to implement an airport but when turned on another iMac loses it's IP address, I would love to go wireless but with these problems I'll be lucky to make it till next week.

Thank You for the response. Upon further inspection more than 1 machine had the IPv6 still on, so now that has been discovered I doubt the issue will return.
Odd Note:
Before I had a chance to review your reply I shut down the entire office (always fun) restarted and reset almost everything and the problem resolved itself for the moment. This has happened several times in the past and I am confident a solution has been found. Thanks Again

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