Thank you for the logs. The logs show one recording at a time - as if the Plex Media Server has only one tuner and not 2 tuners available for the HDHR5-2US device
I have referred it to the development team. It looks like a bug - some similarities with the evidence from @griffths - Plex DVR, Trying to watch Live TV but get error "Unable to tune channel (no parts)" - #373 by sa2000 but not exactly the same.
But please do check that there wasn’t any other software using one of the tuners
The reason there is only few seconds is because the tuner gets picked up when the other recording is stopped - so goes waiting until the tuner is freed
You can confirm this by seeing if you are ok when only one recording at a time scheduled for the time period
