Cooling to in XX minutes doesn't work anymore - always says 1 or 2 min

For some reason, the message “Cooling to in XX minutes” doesn’t work anymore and always says either “in 1 or 2 min” but never anything higher than that even when it will take way more than 2 min to cool to the desired temperature. The thermostat used to indicate the estimated time anywhere from a few minutes up to “2+ hours” which would decrease the longer the system was running and the remaining time was decreasing.