WHS crashes during backup

[Resq]

I have a Dell SC440 running WHS and two win7 desktops on a home net, and previously had WHS running on one of the desktops...backups ran fine. Now with WHS on the SC440 backups of either client crash the server and drop connection from either client until the WHS box is rebooted. I typically get 2% completion on the remote console and boom, it's down.

I've done the backup file cleaner routines through WHS setup and run chkdsk on the more questionable client without any change. The WHS box is using a netgear GA311 gige NIC if that matters, driver is the current (2003) release.

Ideas?

 

[Resq]

Update - I was in denial about the netgear NIC being the problem, but looks like it must be a realtek chipset. Swapped back over to the onboard gige (no jumbo frames) and it's up and running.