Hi,I was just showing my son some game when suddenly the Shield Tablet started to make a high pitched noise and then the screen went black,so i tried to shut it down and this was not possible,seems none of the few buttons would do anything also it seems to be getting hotter,so i put it in the bedroom as the noise was way too much and hoped if it didnt catch fire at least the battery would die out(also you cant get to battery to shut it down)When i went back in bedroom to check after ten minutes ive noticed as i picked it up suddenly the screen apeared and it seems back to normal??Ive just turned it off to be on safe side.Tottaly weird and never happened before its about 15months old and doesnt get used daily.Anybody have any idea as to whats happened or know of same to anybody else?should i send this back?thanks.