There are two things I know of that might have bearing on this.
1. It may be that you have a heat vent that blows warm air directly at the thermostat. You can use a deflector to test this. Running the ceiling fan may also help.
2. There is a setting in the thermostat for the amount of "span" between when it starts and stops. If this is set for the lowest setting, then it won't take much temperature rise to cause the thermostat to shut down the furnace.
Either or both of these might be the cause of your problem. We have the same thermostat, and in our rig it works quite well, but you are not the first to report this situation.
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