Yeah even when they don't get temp stressed, it's common upon repotting for them to loose a lot of leaves if there is any drying of the roots. My potting medium of choice has been large chunks of wood and coconut husk at the bottom of a plastic pot with small aeration holes drilled into the sides but not so many as to let them dry out too fast. Then nest the roots into 1/2"-1" pieces of the same stuff with maybe some added charcoal. Finish by top coating in finer stuff or adding some dirt and vibrating it down into the pot for species that can grow terrestrially. If the roots are healthy and mostly intact they can recover from loosing all their canes.
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