You have root issues I would bet. Your media looks to much like dirt to be in a container. You need to mix in at least 25% perlite, vermiculite, hydroton, or some other coarse inert media that will allow proper airflow and drainage to root area. You can remove the plant very carefully removing all the dirt taking care to not damage the roots. If they are not white then that’s your problem. You can spray the roots with 50/50 water/hydrogen peroxide mix to kill any fungi or bacteria (good included) then repot carefully in correct media. Happy Growing and good luck! 🍀