Video Recording Failure: the resulting video was saved as a set of broken pieces

During my last session Microsoft teams saved the video recording of a lesson of a University course as a set of independent videos instead of a single 2 hours video.

During the session everything went smooth and I started and ended the recording after starting the meeting exactly in the same way of the previous times,m but for some reason, after a few hours, in my stream account, instead of a single video, 5 different pieces appeared. Between the videos there are a small gaps so, we cannot join them together and some content is lost. 

What is the reason? How can we prevent this from happening again? 

thanks in advance