Yep, not enjoying the work in general is definitely one cause, but there are other ones. In our materials, we divide the causes into: behavioral, temporary, and deeper causes. Then we deal with them more specifically.

From personal experience I know that the same work can be daunting or motivating, depending on the personal habits/behaviors and systems. In other words, they are temporary. That's what the course focuses on (not looking for a new job).

In any case, your advice about figuring out the root cause is spot on (and also in the course).