What might be happening if you are recording for several hours or more is the file might be getting too big and it is just breaking because of the size. This would probably be the case especially if you are recording your entire screen.
If you are having this problem even for short recordings, then there is a greater issue.
If you like you cans end us a log file to review and we can investigate further. You can find it in Screen Recorder by going to File > Reveal Log File. Send us the file itself rather than copying and pasting code from it. We need the whole thing.
From Liam @ 12 Apr 2017 10:04