Wireless Charging Orb Slipping

That is sped up by a factor of 30. No case or anything between the phone and charger. And that desk is flat, it will fall even faster if the surface has any sort of incline. After a ~10-15 minutes (less if inclined), my Nexus 4 stops charging. Eventually it will actually fall onto the desk. I even made sure there was no oils from my skin on the surfaces by cleaning them beforehand. Very frustrating for a $60 charger, they really should have used magnets in this thing.