If a few kilobits is 5% of your monthly allotment - time to find a new ISP, pay the overage or stop using Plex. <---- it can only go downhill from here.
Are you using MP4/M4V files?
If so: Move Local Media Assets to the bottom of the stack of active agents under ALL tabs for Shows and Movies:
Red: Where it was
Green: Where it goes
If you’re not using MP4/M4V files - name and structure your files correctly:
https://support.plex.tv/articles/categories/your-media/
If you are naming and structuring your files correctly then you might try clearing your TVDB cache:
That’s all the standard stuff that usually fixes problems like yours - Usually.
