I'll match you sir and raise you one. Your roots look EXTREMELY sad and diseased and tied in a big knot to me. I just had this EXACT same issue with my power plant.

More space....quick.
Hydrogen peroxide....quicker....like yesterday.

If using store bought 3% H202 go with 2 teaspoons a gallon every other day.
Google up "root rot." I'm betting 2 DOLLARS its a space issue.