You might want to re-pot into better soil, perhaps with some sand mixed in. It would be good to take it out of the pot anyway and see what has been going on. Your container does have plenty of drainage holes, right?
If it hasn't been draining well, you could find very wet soil at the bottom with stinky stagnant water. And you could be getting root rot. Check the roots. They should be pale and firm. If they are black/brown, mushy, or smell bad, they are rotted. If some are healthy, you can trim off all the rotten ones and repot into good well drained soil. If it's all rotten, you probably need to trash it and start over.
Way more plants are killed with kindness than neglect. We all want to feel like we are taking lots of care of our plants. But I have had house plants that I only watered once a month.