Vimeo - "Sorry, we're having a little trouble."

Hello there:

I'm adding some Vimeo videos in a course in Storyline 360, but lately some students are complaining about that they are trying to watch the video it appears: "Sorry, we're having a little trouble." This happens with random videos at random times.

I've contacted with Vimeo but all their are being useless.

The videos are embebed as unlisted.

Any solution to this?

Thanks!