10/100 ports stop forwarding on Cat.4506 SupII Cat7.6.7

On one location of our campus various 10/100 ports stop forwarding traffic after some time (port stays in notconnected state, sometimes with linkled on, sometimes off).
This happens on various ports of both Cat.4506 systems on both line-card types:
WS-X4232-GB-RJ
WS-X4148-RJ
We already replaced linecards, without succes.
Does anyone know what's wrong ?

Peter,
You would probably have a better chance of getting a solution to this issue by posting on the LAN switching forum.
Hope this helps,

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