I'm so glad I'm not the only one who's experienced this. It seems like this is a common problem because I have three Monstera plants, all of which have yellowing and even wilting leaves! When I evaluated the situation, it appeared this could be due to overwatering. It might be due to overwatering since I water my plants 2-3 times daily. When I checked the roots, it turned out that they were slightly rotten and had changed color. After that, I tried to improve my watering method by watering once every 1-2 weeks.