I have Plex web server version 188.8.131.5202 running on a Raspberry Pi2 with Raspbian Lite. The Pi is connected directly to my router by an ethernet cable and the library is on a USB hard drive attached to the Pi. For the last few weeks it has been almost impossible to stream videos on my Samsung TV due to very frequent buffering. This happens when using the Plex app on my Roku 3 and also if I use the DLNA player on my TV. Playing music is fine.
I also have Plex running on a PC which has a wireless connection to the router and the same TV & Roku can stream videos without any problem.
I would be grateful for any suggestions.