I was watching a recorded show and the DVR shutdown. On the Apple TV app I only have On Now, Guide and Settings. I am unable to reach DVR via localhost or remote connection. I believe there is a system-wide problem.
The DVR runs in your home, so check the PC or NAS where you installed it.
I did a restart of the channels DVR software and I was still having the problem. I have rebooted the computer now and it seems to have solved the problem. Don't know what happened.