I have a simplicity dc120 skimmer and no matter what I do I can't turn it above power level 4 without it making a ton of groaning/squealing noise, like wake you up loud in the next room. If I turn it off for a day then restart at power level 4 it works for a long time unless it turn it up. It's really annoying. Anyone else have this issue with a skimmer or the simplicity specifically?