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This sounds like it is freezing up. That can be with too cold a setting or too low and air speed or the freeze sensor being bad. Take the ceiling grill off and look up in there and see if the coils are iced up. Let me know what you find and we can go from there. I will need the model number of this off the data tag and the make and model of your thermostat.
Just checking back in to see if you were able to resolve this issue or do you still need more input from me here?