DVR no write access to destination

I just set up Plex last weekend on a Shield TV, and was able to record a program successfully. Today, I had three programs scheduled, and each failed with the message “no write access to destination”. I have made no setting changes since I made the first recording. I did update the Plex Media Server earlier today when I notice that there was an update available. Could that have caused the problem? I am switching over from HDHomerun DVR due to all the problems I have had with it, and Plex seemed to be working smoothly until this evening. I really don’t want to switch back, but I do need the DVR to work! Any suggestions on what may have caused this, and how I may fix it?

Are you using a different location to save your DVR to? There are restrictions on where you can save the DVR. https://support.plex.tv/articles/221099648-limitations-when-running-plex-media-server-on-nvidia-shield/ Check the section on Storage Limitations.