I have a Speed Queen washing machine model HA5001 or HA5001L. Runs great, but once its time to drain it drains for a few seconds--then sloshes the water around in the tub...when it is time for the final spin it does the same thing..drains for a few seconds then stops... and at the end ofthe complete cycle there is water standing at the bottom of the tub.. what could be wrong with it?