Your Portulacaria afra—often called Elephant Bush or Dwarf Jade—is showing shriveled leaves after three weeks without water. While this succulent tolerates drought, your current regimen (watering every 25–28 days in a tiny 2-inch clay pot with high light) is too extreme.
Water thoroughly every 1–2 weeks, allowing the soil to dry about halfway down between waterings. At the first sign of leaf shriveling, water immediately—don't wait for a fixed schedule. When you water, soak the soil until water drains freely; discard excess.
The leaf drop you saw in July was likely acclimation stress. Current shriveling signals underwatering, not overwatering. Adjust your routine, and new growth should appear plump and firm.
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