Update: we fixed what's causing this, so any new video uploads won't experience the same frozen, out-of-sync audio issue. If you've been waiting to post–go for it! We're now in the process of fixing all impacted videos, which will take a bit more time. Appreciate your patience!https://twitter.com/TeamYouTube/status/969298199658733568 …
Just to confirm, have you already checked "Notify subscribers" under advanced settings while uploading a video? Also, you could ask your subscribers to share screenshots and we'll take a look!