I posted this as a comment on the last video player update post, but this is probably a more appropriate place. Based on the comments I've been seeing on a lot of the videos on the RT site, lots of other people are having this same playback issue too.
Every 10-20 minutes, on the high majority of videos over the last ~week, the video will completely stop buffering and I will have to refresh the page. This occurs in exactly the same fashion on several different machines in multiple locations:
-Windows 7, Chrome 53.0.2785.143 m, Intel GPU, at home or work/university
-Windows 7, Chrome 53.0.2785.143 m, AMD GPU, home
-Windows Server 2012, Chrome 53.0.2785.143 m, Nvidia GPU, at work/university
This happens both with Chrome's HW acceleration on and off. The only common link here is Chrome.
On a (seemingly) unrelated note, it appears as if there is either a pretty severe memory leak or the player is taking extraordinary freedoms with its memory caching. It's not uncommon for any of the configurations above, after about 10 minutes of 1080p video play, to cause the Chrome process to exceed 2.5GB of RAM. Which is an order of magnitude greater than that of a full screen 1080p60 YouTube video.
Empirically it appears the memory leak is at least one of the causes of the freezing videos. About half of the time the Chrome process completely crashes as a result of this.