Q.Brown leaves on potted Kentia Palm.
I potted a Kentia Palm a few weeks ago & it is on a west facing balcony. The leaves are turning brown & I wonder if I have over-watered it, or if I put too much Dynamic Lifter organic fertiliser in the potting mix. I lower a blind which is like shade cloth on hot days.
This could definitely be fertilizer burn. This would be the typical symptom. If your container has drainage holes, you can water a gallon of water through. If not, then you will just have to hope the nutrients run their course before the palm dies.
You should only water this when it is almost completely dry.
Here is an article that will help: https://www.gardeningknowhow.com/houseplants/kentia-palm/howea-forsteriana-kentia-palm.htm