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It sounds like the compressor is overheating and shutting down on thermal protection. Have you checked the current draw on the unit or seen if it is shutting off on a thermal limit or a pressure limit? If the condenser is dirty the head pressure could get to high and shut the compressor down.
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Check the wiring to the compressor you may have a bad wire to the compressor making a bad connection
Can you check for power to the compressor with a volt meter to see if it has power when it shuts off?
The signal comes from the board in the furnace or airhandler
The board could be bad and not signalling the contactor, just double check for any condensate pump if you have one as a float switch could cause that issue as well as any pressure switch on the outside unit itself if tripped.
Yes you can do that until you can get it.