Hi Camaleon,
Does "ifdown eth0&& ifup eth0" restore the connectivity?
Didn't try.
If you are running lenny, I would try with an updated updated kernel (if this can be an option at your side) :-?
It's squeeze. I have been waiting since 2.6.26 for a kernel fix. I might try 2.6.37.
Linux groucho 2.6.32-5-amd64 #1 SMP Wed Jan 12 03:40:32 UTC 2011 x86_64 GNU/Linux
Unfortunately it's an ITX board without any pci slots so replacing the card is not an option.
Greetings, Klaus