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It sounds like you have a defective thermostat. The Focus Pro should be under warranty for at least 1 year. Do you know how old this thermostat is?
Your t-stat has a 5 year warranty,
Here is the manual for your t-stat, Last resort try page 7 of manual, if that does nothing replace t-stat.
One thing you can try which MIGHT work. Take the batteries out of the unit and turn the power to the furnace off. Let it sit like this for 10-15 minutes, then replace batteries and power back on. Many times this will reset thermostat and MAY correct some problems.