Droid Maxx will turn off on its own and will not turn back on

Recently my Droid Maxx started shutting off on its own, but it was easy to turn back on and getting running properly again. Today it shut off and would turn back on once and a while and is now just flashing the motorola sign when it is plugged into the charger and will not turn on all the way. It said it was at about 80% when it first died so I left it off and let it charge to see if it was just a falsely read the charge, but now it still won't turn on at all. Any ideas?

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