Rot at the base
How to tell
Soggy roots at the base can also cause drooping because damaged roots cannot take up water. The soil is wet, the base feels soft, and adding more water makes the damage worse. Small dark flies around moist potting medium may be fungus gnats. They suggest conditions suitable for breeding, without proving that the surface never dries.
The fix
Stop watering and let the mix dry out. Remove brown, mushy roots with clean tools and repot in fresh, dry, gritty mix in a pot with drainage holes. Extensive rot in the swollen trunk is more serious than root damage and recovery is uncertain. Do not cut off arbitrary shoots above the rot to root them. Propagation uses seed or suitable offsets, not pieces of a rotten trunk.
