Pool and Spa
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Unfortunately in the short cycle situation there is not much you can do unless you have refrigerant gages. You are likely tripping off on either low pressure or high pressure but we do not know until pressure is checked.
Low pressure could be loss of freon.
High pressure could be plugged exchanger.
Without gages all you can do is wash the exterior coils, make sure good water flow through unit.
I know you would like a better answer, but I would need pressures to start to narrow down. Do you have gages?