More than 7 fields and form become uneditable.

Kris, I don’t see any support tickets from you in our system…did you try to reach out to us at all? We have documentation that addresses the issue you are likely experiencing (though it should definitely not be happening with only 7 fields in your form and only the core plugin installed). This will also not be an issue at all in Ninja Forms 2.9. You can find the documentation here: https://docs.ninjaforms.com/article/202-long-form-saving-issue