I was kinda reading around on this and was wondering about it.
 
Seems like alot of people cure this by upping the CPU VTT voltage. Which most are running it way beyond the absolute max stated by intel to begin with and are bumping it higher and higher to fix the issue. Could it be the chip is degrading causing all of the problem.
 
http://download.intel.com/design/processor/datashts/322164.pdf  just skip to page 67 unless you like to read
 
I guess if you have run into this problem state your cpu vtt voltages that caused it and what you had to set it to for the fix.
 
Maybe state something like I was running it at cpu vtt x.xx for xx weaks then I had to bump it up to cpu vtt x.xx to regain my stability.
 
My chip in sig kinda will step over the line slightly @4.2ghz cpu vtt of 1.27 required. I have dropped my overclock down and am still playing around with my chip. I can run mine at some pretty low voltages so I think I can just avoid the whole issue myself. I've booted into Win7 with my chip @4.597ghz for the screenshot so I think I gotta pretty good chip.
 
My rig in sig is just a toy and it isn't on 24\7 so I'm not worried about killing my chip
 
Thanks for looking and please post your results and thoughts on the subject.
 
Ken

I got the loop when i was only doing moderate overclocks just for 24/7 use.

For 3.6 for 24/7 use with voltages at...

vcore=1.1625 in bios with vdroop disabled
vtt= 1.175
pch=either 1.05 or 1.1 forgot which
pll=1.8

Well this wasn't the only problem i encounter on the p55 sli board at the same time. Also had missing 2gb in bios for awhile too.

the problem has nothing to do with going over the maximum vtt.  I had the issue happen on stock settings simply by switching the bios switch from 1 to 2 on the board and then back to 1 all while stock.