Videos missing

[HandbagMakers]

Yesterday I recorded a session that was 1:20 mins long. 2 mins of the video is there the other 78 mins is missing. I get a message that says can't download video, when I retry I get the same message. I recorded through the studio, I didn't use the podcaster. Is there something I'm doing wrong? Is there anyway to recover the recording? It was very important.