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 soil dry out fully. Check that the pot drains. If only some roots are soft or brown, trim them and repot in fresh, dry, fast-draining mix. If the base itself is soft, the damage is more serious and recovery is uncertain. Only propagate using a method suited to this plant, not arbitrary pieces above the rot.
