Overwatering in glazed pots with poor drainage-roots suffocate before you see mush above soil.

Too little light for the species you bought; “indoor” still needs a real window band.

AC drafts and dry air plus erratic watering-edges crisp, people water more, rot follows.

Check drainage holes and saucer stagnation.

Move to stable bright indirect light for two weeks-no repotting theatre.

Water on dryness tests, not calendar guilt.