I have a 3 year old Maytag front loading washer. Lately, when it fills with water, it rattles and hums when the water shuts off. It started doing this a while ago, so I put 2 of the small screw-on MIP water hammer arrestors on the washer water lines. Last night, twice, the hammer and hum lasted a good 5-10 seconds. When using any of the other faucets, etc. in the house, there is no hammer. One time when the noise started, my wife turned on a faucet and the hammer immediately stopped. Almost seems like the shut off valve is not closing completely, maybe because of hardness build-up? Maybe removal and cleaning the shut off solenoid, or replacing it? Seems like it is happening when the washer uses the hot water, but not with the cold. Any ideas would be appreciated.