Did you repot (includes bare-rooting and root pruning) or just pot up?

The variegated plants seem to be a little more sensitive to issues related to watering (over/under) and fertilizing; and of course they're more sensitive to bright light extremes.

The odds are that it's an over-watering issue, but a high level of solubles (salts) in the soil is also a possibility. Often, plants grown in very bright light and warm temperatures are pushed hard (with maximum fertilizer doses), which is ok as long as growing conditions remain optimum; but when you take a plant that has a high level of fertilizer in the soil out of optimum conditions into a rather dim home setting, fertilizer burn can show up as a by-product of the reduced light levels.

Best advice: Make sure it's in a soil that drains fast enough that you can water copiously, so at least 10-15% of the water applied exits the drain each time you water. This will be particularly important over the winter when the plant's growth and water needs have slowed. If you can't water so you're flushing the soil, it's likely that dissolved solids will accumulate in the soil and cause a variety of problems like spoiled foliage and reduced vitality.

Your plant would like open shade, dappled shade, or early morning (until 9-10) and evening (7 & later) sun, but it won't tolerate full sun well if at all.

Al