It could be a number of things. First off if you were gaging the temp by just looking at your house thermostat then that probably means you do not have a tank temperature and humidity gauge and it would be a good idea to purchase. if the humidity levels fluctuate a lot, that can cause several different behavioral changes in frogs. If you heard a clicking sound when the frogs mouth was open, it could be a respiratory infection in which case a vet should be seen.