Thanks for reaching out and welcome to Netlify’s Support Forums!
Looks like you were able to resolve the issue? I see the last form submission for the form named jvnotify was on November 5th. I also tried making a test submission and see that was received. I was also unable to reproduce a 404 error.
It suddenly stopped working… Then I created this post… And a few days after publishing it, the forms started working again.
I wish whoever did apply whatever change had the balls/willingness to share it with all of us. (likely someone at Netlify tech/support, but I can’t prove it)
The good news is, it’s working again indeed.
The bad news is, we don’t know why, only that the timing suggests someone did something.
Thanks for the follow-up. Unfortunately, I wasn’t able to reproduce the issue when originally responding to this post. I also haven’t seen similar issues during that time period, so I’m also not sure why it happened.