I'm writing for two parts. I have multiple sicce pumps and typically find them of great value for their price. I bought a bigger ADV for my mixing station and to pump to my tank. The first would power on, then off after a few minutes. It pumped silently and powerfully when it worked but was unreliable. Sicce sent me a replacement at no cost. The second pumps continuously but is quite loud and increases in sound under any load. Any advice? Any things I could problem solve on the first pump with intermittent power rather than to throw it away? Tia