The problem is that the LECA pellets on top are too dry, so they are literally sucking the moisture out of the root tips. To prevent that those pellets must be moist.
Raising the humidity is the key, but sometimes that simply cannot be done. As an alternative, some will suggest a layer of sphagnum on top, but I advise against that, as it tends to break down and clog up the air flow. Instead, you might consider a "semi-barrier" to evaporation.
Using a semi-rigid piece of plastic - I like the "acetate" covers used to protects documents - cut a circular piece that's about 2 cm smaller in diameter than the pot. Then cut a straight line from an edge to the center, then remove enough material from the center to surround the base of the plant, giving about another cm of space around it.
Place it around the plant, on top of the medium. You can water normally, as the water will go through the gaps, but the "cover" it creates will slow the evaporation, result in a bit of condensation, and keep the top of the LECA moist.
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