Hi all. A system update with the fix for the buffering issue is now available to users in the Preview Alpha and Preview Beta Rings, ahead of a public release in April. Please see https://news.xbox.com/en-us/2019/03/13/new-preview-alpha-and-beta-ring-1904-build-3-13-19/ for more details. Once again, thanks for your patience while we worked with Microsoft to pin down this particularly tricky issue.