I pay for a Plex sub at the minute, service is spot on! Problem is, there has obviously been an update to my Shield somewhere along the line and now I am having nothing but issues getting errors with Plex playback......it's not the Plex sub as it runs perfect on my Firestick and Smart TV.
Gone back to using Movie apps/Kodi on my Shield. If you want Kodi, use BMC instead it's amazing and always updated.