We are running into a really serious situation with our unsubscribe page where the form doesn't always load for people who are looking to unsubscribe. I haven't ever experienced this issue myself but I've seen numerous screenshots from others. Our unsubscribe page is a Drupal page that has a Marketo form embedded. The form is 4 years old.
Here's the page: https://www.rocketsoftware.com/unsubscribe
We don't have this issue with any new landing pages that I've seen built out.
Any advice would be greatly appreciated.