2 new growths lost to rot, change pot?

[SouthPark]

The whole system is definitely dynamic - although relatively slow. The system is changing. In this case, less roots at first. More roots --- or a lot more (even clumping etc) later. It looks like the system reaches a stage where the roots get so much that the conditions are significantly different as compared with the earlier stages. It looks like this is probably what needs to be solved....as in - how to deal with the condition when the root density has increased a lot - possibly inhibiting air-circulation among all the roots, or build up of stagnant regions of water.