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Hello, it could be a thermostat module problem, or bad wire connection at the air handler unit where the thermostat wires connect, or the printed circuit board is bad (same board where the thermostat wires connect).
Tell me a lot about you appliance repair type skill set, I can coach you a bit, or offer an additional service if you want training.
We can go from there.
I need to know about how old the system is as well.