Three faults
Debris under the diaphragm lets water seep to the heads after the cycle. A failed solenoid can hold the valve open or keep it shut. A cracked body leaks into the box even when the station is off. We open the valve only after we know which of those we heard.
Do not bury the box again
Mulch over the lid is why the next leak runs for a week. Leave the lid reachable. Call 346-642-6161 if the station runs on when the clock has moved to the next zone.