We just bought a townhome and every time we use the LG Front loading washing machine there is a loud bang throughout the pipe system. I checked the back and there are already 2 water hammer arrestors (Size AA) installed on the inlet to the washing machine's hot and colt water intakes. When I checked the water pressure of the cold water it was at 80psi. Does the banging have something to do with the water pressure or could I need bigger Water Hammer Arrestors? We are on a municipal water supply.