Turn off your hot and cold water valves. Your water valve inside the washer has gone bad. What happens is the valves open and close there is suppose to be a filter screen on both hot and cold inlets where you connect the water hoses to. If not the debris from the water line gets in there and clogs it up leaving the valve open which is causing your problem. Also seen it where people on well water have this problem a lot because the water might be hard with sediment . You can have a qualified technician come fix it won't be too expensive hope this helps and thank you for using FixYa!