ASUS P5K Deluxe - Intel P35 Bearlake + E6600 B1 / Q6600 B3

[Silver Fox]

Been playing with my P5K Deluxe + E6400 for a bit now. Currently has 0311 bios. For some reason, my system sorta hangs for no reason at random intervals. It's not a stability issue, it's something else, like the BIOS is just stopping for no reason or something. I'll be running Orthos for awhile, and the OS just sorta stops responding. Orthos continues to still run, passing tests, but AI Suite/Core temp just stops updating, Orthos timer stops, the "GO" flashing stops, Tests continue to pass, can't even push the Start menu, Mouse still moves, but everything sorta just hangs there. I can't even turn the system off using the power switch, I have to turn it off using the switch on the PSU. After letting it cool off a bit, I go back into the BIOS, and the clock is behind, as it seems the time stopped after the "hang" occurs.

Anyone experience anything similar? Really need to figure out what's causing this. This is happening on stock settings even, it's really strange. Got a 40gb IDE hooked up, a sata optical drive on the black slot, both controllers running IDE mode. PSU is Corsair HX520.