Plex keeps pausing



I have an asustor with 8 GIG RAM, with plex media server installed. my TV has a DIRECT HDMI connection to the media server. Every single movie or TV series pauses the whole time. Using Embly on the same media server does not have the issue. I have changed the transcoding to all levels, tried various version of plex, including the latest. Nothing helps. Very frustrating, about to ditch plex totally as its worse that watching live TV with adds every few minutes. Please plex sort this out, reading comments seams like many users experience the same issue