I have the same problem for a while. Uploading files through realtek LAN almost ALWAYS causes system crashes. I tried with XP, VISTA, UBUNTU 8.04, older and newer realtek drivers, all gave the same results. Wifi works fine in every case. Test programs don't find any problems, I tried a lot of them. Sometimes, when I have luck:) it seems as it is working well (uploading without crash), but if I switch off and turn on the computer (not a restart) again the "crash-while-uploading-feature" returns
This is totally random and undetermined.
I think there's something wrong with the built-in realtek network adapter. If I don't use the LAN it never crashes. I bought this notebook 6 months ago but it was more than 4 months in service: bios upgrade/downgrade, Vista reinstall, motherboard switch, hdd switch, last time the wifi card was switched
Needles to say, the problem still exists. I have no other idea than a design failure of realtek card integration by fujitsu-siemens. Has anyone tested with an external network card?
Have a nice time with testing, I have given up, I try to get my money back...