I'd guess bad roots. You might want to unpot it and check.
After any repot job, the plant has to grow roots that are "tuned" to that environment. The old roots will likely start to fail. The rate of failure is determined by the degree of difference between old and new in-pot conditions. The only exception I can think of is when repotting a plant already in semi-hydro culture, as the old and new conditions are identical.
If I have guessed correctly, a few waterings with KelpMax solution will likely help.
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