Why was the plant die?
Here's what can be wrong:
1) If the leaves turn brown or fade, then perhaps the reason that you have too much fertilizer.
What to do: Wash the crystals fertilizer clean water.
2) Perhaps you have filled it. Plant roots need oxygen.
What to do: Stop watering so often. Normally, if the soil is slightly dry up, the main thing that is not dried out.
3) Maybe it does not die. Perhaps this is a shock after transplantation.
What to do: Do not know. The only thing you can do is wait.
4) Change the lighting, from natural sunlight to artificial lighting can cause damage to the plant.