Hello I have the same problem did Apple help you out yet? My iPhone suddenly shuts down and turns back on again by itself with a red screen (with a line), this happens after right after the apple logo disappears. The whole thing is red and it keep restarting and doing the same thing over and over again. I managed to restore it using DFU mode which wasn't easy to get because it crashes before without giving me enough time. After restoring it, erasing it and updating it the problems happens again and again. It's very frustrating because the phone is new and I can't figure out a way to fix it. Can apple please let us know what to do, I can't go back to the apple store because I'm traveling and I really need to use my phone !