I can watch this:

…and there’s very little buffering (a little at the start for a few seconds, but then everything plays smoothly)

I created my own Miro Board and recorded a 4.5min talktrack, and playback is for the first 7 seconds then it’s just as if it’s loading.

Meanwhile, whilst that browser tab is sitting there loading, I go back to the ‘What’s New in Miro - September’ and play that, and it’s fine, yet mine sits there loading and never continues playing beyond 7 seconds.

Any ideas what the problem might be?