I would suspect a lack of sufficient water. Slightly wetting the surface may not reach down far enough to the roots. To confirm, water when it is necessary; wait for the water to drain down to the roots; then insert a finger into the soil to a depth of 6” and see how moist the soil feels where the roots tend to be. If it is dry, either you missed a spot or you need to increase the amount of water used when you water.
Answered on July 3, 2021
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