[ovidiuz]

No luck for me.
I tried with F5 official release and also with the latest beta- F6d. I updated RTL drivers both in Windows and in Linux (drivers dated 02/26/09 for Vista and 02/25/09 for Linux).

The only difference I imagine between my setup and those who worked for other people is the number of drives used. I use 5 HDDs and 1 DVD drive- all on the Intel SATA controller. I did notice some stability improvement when I ran the system with only one HDD and the DVD drive (LAN interfaces went undetected after more reboots). I could be subjective though...

Of all X58 motherboards manufacturers that use on-board RTL chipsets, only Gigabyte seem to have this issue...so I don't think it's driver-related after all.
I think it's a hardware or a BIOS firmware problem...and since no BIOS firmware managed to fix this, I fear it's actually the former to be blamed.