The pump on my 8015C did the same. It is designed, apparently, for the pump motor rotor to run in water, with the pump stator on the outside of the plastic case. With wear, and metal fragments from ???? stuck to the magnet rotor, it gradually got worse, intermittently not pumping, until today, when I had a chance to look at it when again it wouldn't pump. It is easily dismantle-able, and clean-able, but as the bushes in the motor are fairly worn, it is only a matter of time before it fails again... my guess - another year. Ebay has the pumps, and I think I will order one, even though it is "fixed" and working again. (I am an electrician)
Ralph Dean, May 2013