1. Power surge? Happens with my desktop during wind storms.
But I don't leave iTunes running, I shut everything off so it won't blip on by accident. I don't know that I should, it seemed like it'd get going if I looped a playlist. Instead I've looped things like this that I downloaded as mp3s when it was okay to do that. Don't know if it is anymore:
Yogaduke's "Rain Sounds" 8hrs "Sleep