Ok, just got off the phone with "Arlene" at Samsung, she just wanted to send a tech (which I explained to her was going to be a waste because it is probably a firmware issue, isn't just my TV (I've had blacking out on both sets I've had and power cycle (it didn't come back on) on the current one). I said I just wanted to be added to the list of people that had the problem. She said there is no list, no firmware upgrade (duh, its a new set) and at that point just wanted to get off the phone with me .
Earlier today, I was able to reproduce weird video issues, black screens, and just one time I had a power down on the 360 menu, if I go into the "Inside Xbox" section and flip through the screens (these are bright screens). I also have the Xbox video camera hooked up which makes my background unique.
I will try the Halo 3 thing soon.
Does not happen on anything except 1080p, I only have component, no HDMI on my Xbox.
I am going to try some more with my HTPC and see what I can do in the HDMI realm.