I've been watering it once every week or two weeks, fully drenching it outside so the water pours from the bottom. It's living indoors, getting indirect filtered light throughout the day, with short periods of unfiltered light.
I agree, the pot is too small and it is probably rootbound. You could also give it some palm fertilizer while you are at it. Potted plants have to depend on you for all their water and nutritional needs.