As per the title recently my plex has been transcoding content over the LAN from 720p into SD content.

As per the title recently my plex has been transcoding content over the LAN from 720p into SD content.

What’s your video quality settings in the Plex Media Player?
Video Quality: Maximum
Remote Stream: 8Mpbs (1080p)
You probably need to look at the logs to identify what’s causing this particular transcode.