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Hello, It could be low voltage on the local power grid causing the problem, the cure is a 'hard start kit' that consists of booster start capacitor and potential relay that pulls it out of the circuit 2 seconds after the compressor starts. These are less than $100 and easy for any technician to install.
Any tech that has to guess about the thermostat being bad is incapable. Tell me a lot about your skill sets, or if none of that is in your bag of tricks, tell me which direction you are from the center of the nearest town or city and I will see if I can find a well rated outfit for you.