I turned on my Halo today for the first time in about a week, worked fine the last time I used it. Now it runs for a bit (empty) then cuts out, try it again same thing. It does this after random intervals of time varying between about 2-20 sec. Before it cuts out the motor sounds like its running abnormally fast.Anyone have suggestions? I already tried changing the batterys and the light doesnt indicate a jam or anything else its just shuts off along with the motor.