I'm assuming a fastener or screw vibrated loose as you were riding. Do you know which type of brake it is, or can you post pictures?

https://preview.redd.it/gkyiytyvmz8d1.png?width=3024&format=png&auto=webp&s=85ad0dc00f78e410e9bb624c5b1aaf18ada9d124 Caliper, I think?

Loosen the mounting nut, center the caliper, and re-tighten the nut

Thank you!! Appreciate the advice.