Why does my phone keep on restarting then shutting down again?

For the past two days, my phone has been restarting itself to the Motorola logo, then turning itself off, over and over again. I've tried to externally factory reset it and clear the cache partition. Nothing has worked and it always goes back to the Motorola logo only to restart again. Does anybody have any ideas to fix this?

Note: The night before I put my phone to charge at 3%, but it was charging for the entire night. The next day it was in the condition it is now. Don't know if that helps.