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 …
If you wanted to reupload the video now, it shouldn't have the freezing issue as it's fixed for all new video uploads. Otherwise, all of the previously uploaded videos will be fixed soon. However, it's hard to share an exact ETA!