Same issue here but with mkv files with included subtitles. However the subtitles work fine with with VLC on my MBP.
Hardware: iPhone 6s Plus
Software: iOS 11.2.5 and VLC up to date
Same issue here. When I jump backwards or forward a few times, the video stops and freezes, the pause/play button doesn't work anymore (and actually nothing else), and I have to close the video and reopen it. I have an iPhone 6s Plus with iOS 11, and macOS Sierra 10.12.6 with iTunes 12.6.2.20 (on a ...