| Hi
It’s not unusual for bottom leaves to fall off as a plant grows I would be more worried if it was from the top of the plant. This could be caused from the leaves just having run their course to roots that are rotting from to much or to little water. Hold the stem of the plant turn the pot over on to some newspaper and if it doesn’t come right out try tapping the bottom of the pot that should do it. At that point shake off as much of the mix as you can to be able to inspect the roots. Health roots are firm if you pinch the. Soft or mushy root are dead. If the roots seem fine I would rinse off all the mix you can and re pot with fresh mix since it’s already out of the pot. If you find that all or some of the roots are bad trim them back to a part that’s still good or completely off if there that bad. Repot in a good mix and let it sit for a few days to rest from the re-potting. Water as you usually but if the problem is from over watering be careful. I had a similar problem with one of my Vandas and its now doing great.
Good luck
Joe
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