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It sounds like a pressure switch is triggering it to open the unit may be low on freon causing that issue. Are you getting any errors on it?
Do you have the schematic for it?
If you are losing power to the relay something is killing the signal and it is more than likely a pressure switch, You can check the pressure switches with a meter or just bypass them with a jumper closed and see if they run longer. The capacitor you would need a tested for or check for signs of bulging, but still the loss of 24 volts to the relay points to a pressure switch.