The water dispenser on my Maytag MFD2560HES refrigerator stopped dispensing water. I can hear the valve solenoid click when the dispense button is depressed, but no water flows. The icemaker works just fine. The water dispenser has done this several times before. It mysteriously stops, sometimes for a few days, sometimes for weeks, then it will start just as mysteriously as it stops. Generally when it starts it will spit and sputter like the line had air in it. Is there a filter other that the cartridge that could be clogging? I'm stumped...