Icloud restore keeps restarting

So today while I was at work, I took out my phone to check the time, I had about 10% charge left and it was on airplane mode, then out of nowhere my iPhone shut down and the apple logo appeared. After a minutes it took me to the "Hello" screen, where I realized that the phone automatically erased everything. Basically my iPhone was as if I just bought it. I decided to restore everything with iCloud, it works to the point where it says it has estimated of 5 hours left to restore, about ten minutes later, the white bar passes as if everything was done and that 5 hours wasn't needed. I got extremely happy, I get to my "original" home screen and then boom, phone shuts down and white logo appears again and I am on "Hello" screen once again. I've tried this several time. Please help. I wont the restore work? I have iPhone 5 btw.