It's part of the errata for the chip. Go to:
http://www.intel.com/content/dam/www/public/us/en/documents/...
and search for AVR54
http://www.intel.com/content/dam/www/public/us/en/documents/...
and search for AVR54
I'm not claiming that the chip isn't failing; I'm disappointed that the title makes a claim that the article doesn't deliver on.
Quite a few units have completely died without explanation. From the descriptions given by the users it does sound like dead cpu.