Yes i have a PWM hooked up into the motherboard. The pump usually runs around 5600RPMS. I think this problem might have something to do with the molex connector coming lose. Every time i hear my pump turn off and i got to fix the problem. The pins from the male molex connector are stuck inside the female connector. I just replaced the molex connector shield and reseated the pins again. So far no problem. If i continue to have the problem i think i should either put new pins on the wires or replace the pump.