Without a doubt. And rootbound plants can show issues that mimic others.Does that mean it's rootbound?
You might want to try root coring, where you punch narrow holes from the surface to about 3/4 down from top. Really heavy gauge wire will do, something around 9 or 10 gauge (2.5-3mm). It creates pathways for water to get to roots that may have a hard time accessing it otherwise.
Here is a diagram from Derbybud, who introduced the process to me.