I don't know if this will help but I thought it's worth a try
In the meantime, if you have content on YouTube that mysteriously vanishes, Google sent me a list of steps, which I've amended here, that you can follow to send a query to the right place:
1.Go to the Safety Center (link at the bottom of every page).
2.Click on the radio button "Community Guidelines Violations."
3.Click on Account Suspensions (right-hand corner). You will get a message that says "Read about inappropriate content"
4.Click on Contact Us, then Video Removal, then Video Removal Inquiry, then Learn more about video removals. From there the steps are clear.
Cheers Jonn