NBC National News

Our X1 DVR will not record the NBC Nightly News. Our Guide in Seattle (KING 5) shows this program being broadcast at both 4:30 PM and 6 PM. Only the 6 PM broadcast is the actual national news. When I instruct the X1 to record the 6 PM Nightly News, however, it records only the 4:30 PM program. Despite my instruction  Can anyone fix this? The only workaround is manual recording, but that's a one-time solution and cannot be set up as a recurring recording.