Ok so I would offer a prize if I could, but just for fun see if you can tell me what has happened to this plant and in a couple of days I'll let you know what's up. By the way the plant is 3 month old.
Mud Butt... Check the bottom of that pot....for stank toxic shit.
"Root Rot"
Yes, you need to pop the plant out to check.
If it is, shake off most of the soil and transplant into new soil.