Portege R500 hangs/pauses when connecting via LAN

My Portege R500 acts like this: When using WLAN or 3G everything works just fine but I would like to use LAN for better performance when at the office. As soon as the LAN cable is connected the machine starts to make strange pauses for 1-2 seconds and I mean total pause, even the mouse pointer gets stuck on the screen. This happens each 5-10 seconds and immediately stops when disconnecting LAN.
Anyone have a solution or explanation for this? Hardware error? I have all the latest drivers from Toshiba, even the latest firmware for both the machine and for the built-in 3G modem. No strange or ill-behaving software is used, antivirus is Trend OfficeScan and Windows standard firewall is used.
Thanx in advance.
/Magnus

Have you possibility to test it at home or elsewhere? It will be interesting if the same happen if you connect your notebook to router at home.
Have you spoken about it with your local administrator?
What you can try is to make BIOS update to see if this will change anything.

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