How can I explain a fault that stops before anyone sees it?
Note the pattern you already saw: when heat started, whether the room reached its target and what happened just before the stop. A short video from a safe place may help explain a sound. Do not keep running a failing system to make the fault happen again.
Keep a record of the sequence
Note whether the thermostat still asks for heat when the system stops. Did the screen target change, or did it stay the same? Add any filter change or blocked vent you know about. These details may help separate a control change from an equipment stop.
Cycle length alone cannot identify a failed part. If the furnace keeps stopping before reaching the target, turn it off at the normal thermostat control. Seek qualified help. A gas smell or alarm means leave first; do not delay to touch controls.
Plan for a fault that comes and goes
If you are away from the North Naples home, give your notes to the person meeting the technician. State which control is affected and roughly when it happened. Do not ask someone to force more shutdowns in an empty home.
If the building restricts access times, explain this before booking. The fault may be hard to catch, and the unit may be hard to reach. Make sure the visit can reach the right equipment.
Ask what supports the proposed fix
The fact that heat stopped is not the same as knowing why. Ask what test found the cause. Does that finding fit your notes? If someone raises equipment size, ask for the basis. Cycle timing alone does not support a new furnace. Keep a copy of the finding, including anything that remains unknown.