Most likely it is getting too much water and the soil is staying too damp for too long. This can drown roots and browning leaf tips is a classic symptom. During the short days of winter, houseplants need a tiny fraction of the water they need during the longer, sunnier days of summer. let the soil get quite dry between waterings and then water sparingly. never leave it standing in a saucer of water. Here’s a link to a page that may be of help.