Live DTV transcoder fails

When I try and tune a DTV channel I an error message “Playback was terminated by the server. Conversion failed. The transcoder exited due to an error.” I exit out and go back in and it works fine for a day or two. I am using the Roku +, Plex server Version 1.12.2.4929 (running on Ubuntu 16.04, 4 CPU, 4 GB Ram), HDHomeRun CONNECT Duo Model: HDHR5-2US Firmware: 20180327 tuner. It just started happening about a month ago. Let me know if you have any ideas. PM me and I can send the log file zip.

Thanks!