Major problem with my P5K deluxe.

I'm running an E6600 @ 3.6ghz using 1.3625V (1.33V in Windows)

RAM @ 1200mhz 2.25V Crucial Tracer 1000mhz

If I leave the Asus probe open, every 5 to 10 minutes I get the "alarm sound" and the Vcore shows as 1.7 or 1.65 V. I stop the alarm and the Vcore reads normal again.

What the hell is going on?

Bios 311 BTW (I don't know about the previous bios. never had PCProbe open for a long time)