Refusal to take advice
Loss of confidence that the client will take advice
Ill faith (that is, doing something out of spite, or malice, or as a power gesture)
Pursuing a matter where there is no merit to it (this is, only because "it's the principle of the thing")
Wanting an outcome that isn't available at law
Cross-checking the lawyer's advice with lay people/ family/ relatives/ other lawyers
Also, you may care to
read this.
In any event, yes, you still have to pay the lawyer
for the work that they've done up that point.