Arrived to a system evaluation. Customer states that the two stage Amana heat pump will shut down randomly. Previous technician found a "04" locked rotor code and installed a hard start kit to help upon start up. Customer performed hard reset on the system before I arrived. No codes present. Refrigerant levels, system static pressure and all amp draws are acceptable. All electrical connections are tight. Could not find a reason for failure. Performed update on system via the CoolCloud app. System running and cooling the home upon departure.