[lug] Network connection dying mysteriously

[siegfried]

My network connection is dying mysteriously. I did an image backup last
night ("telinit 1; cp /dev/sda /dev/sdb") and that is the only thing I can
think of that has changed.

After rebooting, I can ping my router but after 20 minutes or so I can no
longer ping my router. I reboot again and everything is fixed for another 20
minutes or so.

Does anyone have any suggestions on how I might diagnose this?

My network card is not a separate card, it is on the mother board. I run
marvel drivers for my NIC card.

I suppose I could get a separate NIC card and plug that in and see if it
fixes the problem. Uggg.. Any other ideas?

Thanks,
Siegfried