I don't think SP 2 is anything but annoying security updates. I've eliminated a good portion of the crap with it. But i doubt I got it all.
However, I've had SP 2 since it first game out. Evidently we were one of the first of the limited release folks(they only gave it to a certain number of folks at a time through automatic updates). And i haven't had any problems with the board until the last few days.
Which doesn't rule out SP2, mind you. But I have a hunch it's something more on the board end since everyone seems to be having these probs at the same time.