Where is the location of the dried up leaf? If it is the lower, older leaf drying out that is okay. But if the drying out one is a new one at the tip, then I would try to pull out the plant from the media to check it out again.
The onset of cold season is always dicey to some succulents, that is why great caution in watering frequency, giving more light and making the media very well draining to help it dry out faster is very important.
