Sample .mp4 video: Niclas Lucenius - Ex-Tapparat - Tappara.co
On Chrome browsers (Android, desktop), if you click on the video player to make it full screen, the full screen players closes after a second and the user is bounced to a different location in the topic. This is very similar what was seen with YouTube earlier, but YouTube still works.
This is not-repro on desktop Firefox, so could be Chrome specific.
Our setup runs on 1.9 stable branch.