I have a very big 6ft tall, beautiful Dieffenbachia, up until now. It has grown in the same spot for the past 3 years. But now I notice that the edges of the top leaves are staring to curl a little bit, it looks almost droopy. It's not a water problem. But I did put a stick in the pot as it is so big it's going to fall over. I just stuck in the dirt. Do you think I may have broken the roots and it's affecting the plant?

TIA