I suggest you deep soak the plant.
You need to submerge the whole pot into a bucket (or sink) of room-temperature water. The water level needs to be well over the rim / top of the pot.
Leave the pot in until the bubbles stop (takes longer the bigger the pot).
Do this regularly.
An important thing is to water thoroughly when you do water. You should water when the plant needs it and not just to a timetable. Stick your finger in the potting mix: is it dry, wet or just right? If wet: don’t water. If just right: water thoroughly. If dry: deep soak.
Thank you @brightcolours yes I check regularly to make sure it get enough water. It's in a 13cm pot and is near 30cm tall. I've never submerged it, I water it until the water flows through the drainage holes at the bottom. It's in a south facing window also.