Plex stopping streaming

Hello,
I’m using Plex for about a year and recently I upgraded my Roku to Roku Premiere+ to enjoy HDR support.
Since then, I’m experiencing interruptions on the playbacks of my movies. I ready some discussions about Plex hanging or frizzing, but those aren’t my case. In my case, the streaming stops like when finishes a movie and shows a screen with related movies. Also, if I click to play the same movie, it goes back to the beginning with no choice to jump to the previous position.
My server is an AMD Bulldozer with Windows 10. Both computer and Roku are connected by wire to a router.
All decoding are handled by Plex.

Thanks for the help.