What a coincidence! I'm having problems with mine too. It's not always starting after power off any more, and it seems weak, if I have the water level too high, it can't push enough water through it to begin sucking in air.
dpstrand and rich1p that's how mine started. It stopped working I took it apart cleaned it and worked for a few weeks. Then little by little lost power and would not always start. Then it died completely. Bought new impeller and good as new.