This is a sign of vascular stress. It means the roots aren't keeping up with the leaves' water needs. Did you let it dry out too much? Do you keep it too dry? Are the roots in good shape? Are you using good quality water? Are you making sure to flush the pot periodically to remove excess salts? Are you fertilizing heavily?
This hybrid should NEVER dry out. In fact, if all your other growing parameters are good, it would appreciate sitting with a bit of water in the saucer and frequent watering, up to and including daily watering. Water should be high quality, feeding should be moderate, with monthly flushing to remove excess.
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