Network disconnects when speed is changed to gigabit

For over a year this machine has been connecting to a network at gigabit speed with no problems. Over the past few weeks it started having problems staying connected. All mounted volumes would be disconnected then an error message would pop up saying they were unavailable. No other machine on the network would have any trouble staying connected.
In the process of working with it I switched the ethernet speed to 100 instead of 1000 in the network control panel. At this point I would see the link status change to active in the info tab of Network Utility. Change it back to 1000 in the control panel and the status would change back to inactive in the utility.
What can be causing this? No other machine is having trouble like this. Nothing has been changed hardware or cable wise anywhere. Server, switches, workstation have all been powered down and restarted. Once the speed was changed to 100 base all has been fine, except for the speed.
Any thoughts or insight would be appreciated.
G5 dual 2.5 ghz Mac OS X (10.3.9)

Moderator Comments and Action:
@ user 884082,
You originally attached this post to a forum thread that ...
(1) was old and long dead,
(2) was NOT about any of the Sunfire Midrange systems and their specific hardware.
This post has been branched away and made into its own thread for you, with a new title.
Advice:
ALWAYS start youru own new post when you have a question.
Do NOT hijack a discussion away from soneone else.
Such hijack posts might just get removed without notice if you continue that behavior.

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