Seriously mine did this last night and again this morning.
Last night I was able to boot from recovery mode.
This morning nothing worked. I had to reformat the phone from revovery.
I wonder how many people are having this issue. I dont thinks it a wifi issue, but in both cases, it didnt start until i left my house and went out of wifi range.
I have to see if it will duplicate it again now that im reformatted.