Network problems..

I have a MSI motherboard with integrated gigbit network, Broadcom NetXtreme 5788 chip. This board has worked really fine with Windows XP for more than 6 months, but now when I try to run SuSE Linux on it I run into serious problems. After a while it seems like the network "dies" on me and I loose connection. If I then do a "/etc/init.d/network restart" it comes up again. Are there any known issues? I could put in a separate NIC, but if there's a solution with the onboard chip I can as well use it. Anders.