My stories aren't about problems. I prefer the term challenges. Even then, my books are not about challenges. They're about characters who have challenges.
In the first of the Pearl the Magical Unicorn series, Pearl the unicorn has a challenge to face.
She can do magic, but she can't easily control it. That's not the challenge. The challenge is this:
Should she continue to do magic in a hit-or-miss fashion, or should she give it up? The further challenge is; if she gives it up, will she still be her?