MAC loses IP address on Reboot and when goes into sleep

We have a couple macs running on a corporate network with a Cisco infrastructure. Windows servers on the back end providing DHCP. Macs are connected to Cisco 3500 or 3700 series switches.
When the macs go to sleep or stand by mode or even sometimes a reboot they do not grad an IP address or they loose their IP address and just have a 169.x.x.x ip.
We have to reboot a couple times or wait awhile for an IP to come up.
We have consulted Cisco and some local Mac dealers and no one seems to know what to do??????

Hi, and Welcome to the Disscusions robbamann!
If it's an encrypted network, One thing that can work, try this, please ignore the exact symptoms and connection and Hardware types, it's worked for many others than the stated...
http://docs.info.apple.com/article.html?artnum=304482
A workaround might be to use these in Terminal, or write a Script for them...
sudo ipconfig set en0 BOOTP;sudo ipconfig set en0 DHCP
sudo ifconfig en1 down;sudo ifconfig en1 up
Change the en# as appropriate.

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