I've been using the exact same setup for a couple of years with no issues. Now, I go to watch a show on Plex and about 10 minutes into the show, it stops playing as if we hit the end of the show. It doesn't remember where we stopped, and marks the show as watched. I have to re-launch the show and fast forward to get back to where we were. After that, it starts doing the same thing every few minutes. It seems like the farther I get into the show the faster it stops playing. Oddly, I watched all the way through several shows earlier today on the same device. Both shows I've noticed the issue in are MKV format while the shows I watched earlier were MP4.
I have a massive amount of MKV files and it is strange that this is a new issue on devices that have worked just fine in the past.
Any help is appreciated.