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My LG G4 keeps turning off by itself, or freezes then turns off by itself and now it freezes on the reboot page where it shows the LG logo on it. When I tried to factory reset it manually with the buttons it froze on the confirm page. What do I do to fix it?

Are you able to enter safe mode? You may have malware installed on your device that is causing this nonsense. https://support.t-mobile.com/docs/DOC-28