First off - I don't think the TV recording is stable yet. This type of problem happens pretty often and I don't record that much TV...
I setup recordings for last night's NCAA basketball games. I'm on the west coast, so one at 4PM and one at 630PM. I forgot to set it up, so the 4PM recording started at about 5, but that's only relevant because the seize is half as expected.
I watched some live, finished the first game and started watching the second. I'm watching on a client PC. Halfway through the second game, I hit stop and figure I'll finish watching the rest today. Today I go into MC, find the 630 recording and hit play. Nothing plays, and the duration doesn't show in Theatre View. I remote into the server and go to Television > Recordings and it shows the 630 recording with nothing in the Size column. I then look at Video > Files, find the file and it says it's 1.4 MB, the 4PM recoding shows as 10 GB. This isn't possible because I watched the recording live for about half the game, so it should be 20-30 GB. I went to Video > TV to watch it, not to TV > Schedule so it wasn't just paused TV that was lost.
I look at the network drive with the jtv files on it and there are files dating to 11PM (which makes sense because I think I set it to record for an extra 120 minutes). There are in fact, 38 GB of files in the folder named NCAA Basketball Tournament - NCAA Basketball Tournament 2016-03-24, which seems about right. But for some reason they aren't showing in MC...