Question
Just use 3 hours of iphone5s has been unlimited restart for almost 2 hours, what the situation Ah!
Solutions
First, in many cases, the restart is due to software conflicts, see if there are applications in the background have not quit, some words to exit, or a few specific applications cause restart, then delete the software.
Second, enter the DFU mode to restore the factory settings, using the USB cable to connect the iphone to the computer, and then you will hear the computer connected to the successful sound. Now please turn the iphone off, and then you will hear the sound of the computer not connected successfully. Hold down the switch key and the home key at the same time, and continue to the first 10 seconds, please release the key immediately and keep holding down the home key. This time itunes starts automatically and prompts you for a recovery mode (the iphone will remain in a black screen state).