GIFs have no problem when it comes to playing but the videos (with sound of course) will play but the visuals will freeze up in one position and the sound will keep playing. It will let me go back to before it freezes and go to the same spot and freeze again. When I try to skip past it, it still remains frozen on the same image. This has been happening for some time now so it’s not just one subreddit nor video. Hope this helps any and feel free to message any other questions that you may have!!
I am on an IPhone SE if that may help with anything.