I am encountering a problem with Plex on my FireTV where when I am playing a video, if I try to fast-forward it will just restart from the beginning instead so fast forward doesn't work at all. I run into the same issue with resuming play if the video has been stopped, or trying to rewind. I am not facing this issue with every file I try to play, but enough that it is a serious problem for me (seems to be about 50/50 now).
I just updated to the latest FireTV app a couple of days ago, but I was having this issue before that, and am still having it after the update. I have tried restarting the FireTV and Plex server, installing the latest Plex server updates, nothing has helped.
When I play the video in the Plex Web App on my computer, or on my iPhone app it seems to work fine, and let me fast forward etc. I am currently only seeing this problem on my FireTV.
I am hoping someone can help me out with this problem.