We have the same problem - although we've observed it happening with previous versions too. The length of the repeated video is variable, sometimes it just plays a second, other times 5 seconds or more.
The only way I have found to get round this is to edit some black onto the end of the video so you get chance to manually move to the next item before the video repeats.
This has been mentioned in another post on here, but I can't find it now.