The loss and shift of the magma through Subvolcanic, Volcanic and Super-volcanic activity to Cavities, Calderas on the Crust and Pockets on the Asthenosphere, greatly weakens the magnetational pull of the Core. As of it, the buildup of magma on the Crust forces magnetational pull and interference upon the Core further weakening its field. We are on the last phase of this change, the next Poles shift will be the last one, because the Planet’s Core will not recover. Pending General Fragmentation.