My brand new mainboard with the latest BIOS (060) and Win7 x64 OS, fresh install and latest drivers, the ethernet controller on this board fails randomly (~ 1/day). When this happens the network connector appears as disconnected, and nothing will help to restore the connection, you have to either:
- restart your computer, but sometimes it hangs during shutdown, and you have to reset,
- reset your mainboard.
Disabling and re-enabling the connection will not working either, the disable command will hang indefinitely.
I can confirm that the issue described in my first post does not occur on the 2nd internal NIC (82579V) when both of the ports are enabled in the BIOS. So it looks like only the 82574L port is affected by this problem.