Hi,
I am using latest Plex beta at the time of creation of this thread.
I configured a DVR tuner to each of my PMS and I during the creation process, the DVR tuner is configurable (channels, settings, etc) and visible afterwards. A certain time later (from a couple of hours later up to several days later), the DVR tuner device becomes unconfigurable via Plex Web in the PMS settings. This is the same for my DVR tuner ( AVM Fritz!Box 6490 Cable ) from Windows as well as from QNAP Plex Media Servers.
It looks like that (QNAP):
… and on Windows:
The DVR continues to work, so you get the program schedule and you can record programs (with the buggy implementation that you can find in other DVR-related threads), watch LiveTV, etc… but I cannot re-configure channels or the tuner device itself without completely removing it and re-adding it (which looses the channel list, etc).
I guess that Plex is using some kind of recognition method which does not work with my Cable tuner in the long run… but I don’t know for sure. Since the AVM Cable tuner is not officially supported but is in the list of Community Supporter DVR tuners, I am here to ask for help 
Thank you in advance for your kind help.
I am willing to send logs to someone who wants to analyze the problem…

