Thanks for the tip. I have omen but do not run it and still have this issue on occasion. Like you never the same dude and can never tell when it is going to happen. I will have to take a look at my other addons.

Omen will be obsolete when WotLK hits (maybe 3.0) with the built in threat tools. Well maybe not fully obsolete but it should be "smarter" and less resource intensive then it is now.