Exclamation [Q] Phone hard locked when taking a photo

My Moto G has hard locked and refuses to shut down when holding the power button. I'm trying to avoid letting the power run out to cycle it as the Moto G has a history of not charging when the battery runs out completely.

Any advice?

Edit: I waited 2 hours and held the power button down and it eventually turned off after 4 minutes. Weird.