Hmm my X900E seems possessed by Netflix. I just got back in and for the second time this week it has turned itself on to the Who's watching Netflix screen after I had turned everything off for sure. I did watch Netflix on it earlier today.
I disabled remote control from other devices in the settings which I hadn't turned off before, maybe that helps. (All other remote wake ups and what not are off as well) When I google it the same issue comes up with Samsung TVs. Maybe it's the Android OS doing it, the tv had a software update a week ago. I could always unplug it but the boot up sequence takes half a minute (fuck modern tech)
At least the Netflix welcome screen shouldn't burn in over night on a LED tv, yay?
Update / Solution:
Apparently it is the OS that keeps the apps running in the background. Both times I had watched Netflix before it happened and it seems there is a bug in the OS that it can sometimes switch back to the still waiting Netflix app in the background after turning the tv off. To make sure it doesn't happen, press the home button for 3 seconds which brings up a list with the running apps and dismiss Netflix before turning the tv off.