Facebook will unpublish your page if you are violating any of their Facebook Pages Terms. This happened to some of our clients several times. Even though it's your own page and you can do whatever you want with that, still there are some restrictions. If your page represents a scam business, pharmaceutical sales complication, etc.. there are several restrictions like this.
You can use this form to appeal a Page Policy Violation.
This is just an appeal, so you might or might not get your page published again. Have you ever faced any issues like this? How's your experience?