Don’t mean to revive a solved thread, but this might be a situation we’ll see more of. It might have been over heating issue with the battery. Did your phone get hot while charging? Mine (same e4) hasn’t switched off like this, but the phone gets hotter than expected. I’ve seen the same frozen state on my previous moto x when it had an old battery and it had over heating issues. I changed the battery and solved heat issues. With this moto e4 I’m seeing signs of the battery being old-ish. So according to battery university, improperly stored battery develops this “habit” of over heating and its charging measurements become unreliable. On my e4, I’m seeing battery levels jumping from time to time and mV levels move back and forth. These are signs of a battery that’s not in good shape.
So I’m thinking about posting a new thread for this focused on the e4. May be other e4 users seeing the same thing. RW then could possibly solve the battery issue before it creates bigger problems. Over heating could kill the phone.
(In case the frozen phone happens again: I solved it on my moto x in the past by disconnecting the battery and then clicking the power button quite a few times to use up any micro level power left in the sys. Then put the battery back in after it cooled off. That tend to fix it.)