I can confirm that it is still happening. I have reported the issue months ago but no one bothered to answer:
@james00794_1 I have a workaround for you - maybe not workaround but “a way” to finish the show episode without restarting the TV. In my case when the issue is occurring the “wheel” is spinning for a while before “An unexpected playback problem occurred” message pops up. Once I noticed the freeze and spinning “wheel” I have to grab the remote as soon as I can and press < “left” on the remote, then the video is skipping 5 seconds back and I can finish watching the episode till the end. I hope Plex people will not consider it as a “resolution”. I would totally buy Plex Pass if not this issue.