An issue with Windows 8/8.1 is the Fast Start feature. With this enabled, you never actually get a full shutdown, which is needed by Norton, and other programs, every once in a while to fully update itself. See this information from Windows Eight Forums on how to turn off this feature. http://www.eightforums.com/tutorials/6320-fast-startup-turn-off-windows-8-a.html
Maybe this is part of your 'Looping reboot' issue.