Why?
I'm assuming you are being flippant.
Its normally the metal inner case that stops them, not the actual microwaves. It could be that in this Microwaves case its lo voltage circuits, like any display it has are powered by a switch mode psu, one of the el cheapo Chins ones, and it is that which is radiating. There are some pretty dire examples of this around. Ether way, your only real recourse is to move the dot to a better signal area, or you could try, if the router supports it changing the channel its using and let the devices it again. I'd not bet any money on it especially if its one of the older versions of the dot. Brian