Common problem with any washer ... one (or both in rare cases) of the water valves has gone bad, isn't fully shutting off. Could be obstructed with a bit of debris from the household water supply, such as a grain of sand.

Turning off the supply faucets when the machine is not being used will stop the leaking.

Turn off one faucet at a time to determine which valve -- hot or cold -- is the culprit.

There are several models labeled EcoSmart and you didn't provide your specific model number so I can't at this point tell you what are the part numbers for the valves. It's an easy repair and the valves are reasonable cost, $35 to $55 depending on which valve and supplier/source.