My Moto G 3rd Gen has lost its ring. It had been set to ring and vibrate. Now it’s vibrate only. Tried Airplane mode on and off. Tried new ringtones and the phone doesn’t give a ‘sample ring’. Phone was delivered 5/2/16.
is there any chance you are in Priority Mode (is there a star in the right side of notification bar? )
is there any chance you are in “Do Not Disturb” Mode (is there a circle with a slash though it in the right side of notification bar? )
is the Moto App putting the phone in sleep mode (do you see a crescent moon icon in the notification bar?)