Mac Mini and Gigabit Ethernet problems

My iMac will start to run on the gig network talking fine to my new Intel SS4000-E NAS, then after about an hour of inactivity the ethernet port will lose its DHCP address and drop to a 169 number.
If you open the network tool, you can not get a renewed address. The only way to get the interface back and running is to reboot.
I was working tuning Jumbo Frames to get the most out of the network, and I thought maybe it was the jumbo frames, so I moved it back to the default, but found that not to matter.
it seems to be the GIG port speeds that do this, if I run at 100Mb the port does not show this to happen.
Any comments Apple?
I have a Netgear GS116 switch, Intel NAS and several PC's, all with Gig cards, non of the PC's exibit this issue.
Anyone see this show up in their units?
- Joe

Yonder In Mn-
We are not Apple, so we can't help you with that.
The machine isn't going to sleep is it?
Did you try a different port on the switch? Checking the cabling is an excellent idea. Sometimes they cheat and do not wire things to true Cat5 or 6 specs.
Luckk-
-DaddyPaycheck

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