Did you run SETUP before you ran GO? Probably yes.
In which case, the most likely problem is that you left the GO (forever) button running when you finished (saved) the video.
After the moment the video gets saved, then the video recorder goes back to the "unstarted" state.
The proper order would be:
- run SETUP
- run GO for a while
- stop the GO button from running
- Save your Video