Macrocentra said:Looks like an overwater. The leaves becoming transparent are typically due to overwatering.
Is the pot able to drain? If so, the soil mix may have been too rich and didn't allow it to dry out quickly enough.
Light and temperature can affect the plant's ability to take up water, and the pot's ability to dry out as well...
Likely a combination of factors here, if it was only watered once in a month or so.