The only Motorola I had was Moto G4 plus and was pretty good but software updates were slow , think because I was in the US
I had the same problem on my tablet, very frustrating . But thank you that worked for me.Just in case this hasn't been solved yet: The cure (on my moto) took me half-an-hour to figure-out, but it's really simple . . . . To unlock the padlock just swipe down
Tony