@pspnob@pspnob i had the same problem my phone could not turn off it was some kind of a loop and when i was trying ti shut it down it was opening again what you have to do is to connect ur phone to itunes then push the sleep button to shut it down although yo know it wont and immidiately to hold...
to palikari ta spaei ton eixa dei me to salata band t kalokairi kai itan oloi tus xekardistikoi