Happened to me once. It was not a cold day when it happened. I did a ctrl-alt-delete and all was well. Just turned it off and turned it back on. Hasn't happened since. I was driving moderately aggressive but the oil temp was not above 210-215 so it was not that aggressive. I have no idea why it happened but I have driven many different conditions, colder, hotter, wetter at many levels of aggressivness, from not to highly. So, knock on wood, hopefully that problem will not rear it's ugly head again.
I like the doughnut dizzy spell diagnosis.
