While I agree that un-plugging and plugging them back in my get them to catch better, my experience with these power heads is really bad. All I do with the one I still have is mix salt...
If you are using it as a power head and not a pump, then an upgrade to a single Jebao WP25 would be the most cost effective thing you could do to get both quiet and better reliability. The added control, and wave functions would be so far above and beyond what the the marine-land power heads are capable of it is not funny.