Iphone 5 64gb, Gave this to my son a couple months ago after i got my 5s. Seemingly it will out of nowhere start to reboot constantly or get stuck on the apple logo, other times it won't want to turn on or charge unless i do a hard reset. Sounds like a hardware issue or possible water damage, but the sensors look good to me. The odd thing is doing a restore, or a full restore and setup as new phone. It will work for days and then out of nowhere it will start happening again. *EDIT* Ahh i just remember this a refurbished unit that i replaced my original iphone 5 back in September 13, so my warranty is good for a year on this one. I will bring it in today to have them check it out.