Xbox One S switchover causes Plex problems

I was watching a movie last night on my XBOX ONE and it played perfectly (and has done for the last 18 months with no issues). Then today I got my XBOX ONE S and switched consoles. When I now play anything in PLEX it pauses every 15 to 20 seconds. I thoughthink at first it was my connection or XBOX ONE S 4K settings. Nothing worked but then I thought I’d try PLEX on my LG TV. It’s on the same network and all videos played perfectly. So is the XBOX ONE plex app having trouble with the new XBOX ONE S? Looks that way to me