4 of 6 Macs on Cat5 LAN Network drop connection because of loose cable?

Ok, where to start.
We have 6 Macs on our network, 4 of which are Power Macs G5s with OSX 10.4.10, the other two are newer MacPro's.
The 4 Power Macs loose the network connection at random times(not all 4 at the same time), after replacing the entire infrastructure (Switch, DCHP/Static addresses, router, patch cable, etc) we still have this problem.
After much trouble shooting we finally could recreate the problem, when opening the Network Utility and monitoring the link status active/inactive state we could get this status to switch by just slightly bumping the Cat5 cable on all 4 computers. Yes we have replaced all cables with store bought patch cables.
All 4 computers were bought over a years time, not at the same time. And no, Apple support has been of very little help, they just say they have never seen this problem before and thats about it. (3 hours on the phone for that)
These are the only 4 computers on the network having the problem in a mixed windows, mac enviroment.
As of this moment we are buying replacemnt PCIe network cards to try to resolve this problem.
Anyone else ever seen this? Could it be a wide spread design flaw in the Power Mac G5's?
Any help is greatly appreciated.
DM

A lot of times PC cards do work in Macs without saying so, but no idea which PCIe ones do.
Did run across "Yukon 88E8056 Ethernet" which if I read correctly can be made to work in a Mac...
http://www.insanelymac.com/lofiversion/index.php/t34446.html
And if you can find where to get one, it should be cheap since it was chosen for tje $100 Laptop project...
http://www.marvell.com/products/pcconn/88ALP01.jsp

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Thanks to take time to read this post.
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Message was edited by: rewq

rewq wrote:
1- I would like to be able to *connect to the LAN network over the internet* so any body at home can connect to there Mac at office. For the momment, with the HTTPS site we can only connect to the server. How can i setup de "Server" or the rooter to be able to connect to any mac in the network.
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