There's never been a pattern, and now that I think about it these have been a problem since a little before Leg bricking. I'd be in the middle of something and then "OK IT IS SUDDENLY VERY HOT. I WILL LIE DOWN." or "I DON'T CARE WHAT THE THERMOMETER SAYS, IT'S 2°F IN HERE PASS THE BLANKETS. "

Matter of fact I had one in the visit where we found the ear infections. I went from perfectly normal to running so hot a temperature was evident by radiant heat A FOOT OFF.