Upcoming iOS 7 update to fix random reboots 

Some iPhone users have been reporting random rebooting on their phones ever since they updated to iOS 7. The phone would just go to the black (or white, depending upon the color of the phone) boot screen, before going back to the homescreen.

Apple is well aware of the issue and is working on a fix. Apple spokesperson Trudy Muller told Mashable that Apple will be providing a fix for the problem in the next version of iOS 7.
Apple recently released iOS 7.1 beta 4 to developers. The new version has some minor UI changes and bug fixes. Hopefully, the final version will be available soon to users.